Note 5 - Employee Benefit Plans (Tables)
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12 Months Ended |
Dec. 31, 2017 |
| Notes Tables |
Ìý
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| Schedule of Net Funded Status [Table Text Block] |
| Ìý | Ìý | | Ìý | Ìý | | Ìý | | Change in projected benefits obligation: | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Projected benefit obligation at beginning of year | Ìý | $ | 4,833 | Ìý | Ìý | $ | 4,884 | Ìý | | Service cost | Ìý | Ìý | 147 | Ìý | Ìý | Ìý | 153 | Ìý | | Interest cost | Ìý | Ìý | 201 | Ìý | Ìý | Ìý | 215 | Ìý | | | Ìý | Ìý | 82 | Ìý | Ìý | Ìý | (203 | ) | | Benefits paid | Ìý | Ìý | (231 | ) | Ìý | Ìý | (216 | ) | | Projected benefit obligation at end of year | Ìý | $ | 5,032 | Ìý | Ìý | $ | 4,833 | Ìý | | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Change in plan assets: | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Fair value of plan assets at beginning of year | Ìý | $ | 4,937 | Ìý | Ìý | $ | 4,551 | Ìý | | Actual return on plan assets | Ìý | Ìý | 552 | Ìý | Ìý | Ìý | 413 | Ìý | | Contributions by employer | Ìý | Ìý | 98 | Ìý | Ìý | Ìý | 189 | Ìý | | Benefits paid | Ìý | Ìý | (231 | ) | Ìý | Ìý | (216 | ) | | Fair value of plan assets at end of year | Ìý | Ìý | 5,356 | Ìý | Ìý | Ìý | 4,937 | Ìý | Funded (u nfunded) status at end of year
| Ìý | $ | 324 | Ìý | Ìý | $ | 104 | Ìý |
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| Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
| Ìý | Ìý | | Ìý | Ìý | | Ìý | | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Assets | Ìý | $ | 324 | Ìý | Ìý | $ | 104 | Ìý | | Liabilities | Ìý | Ìý | — | Ìý | Ìý | Ìý | — | Ìý | | Ìý | Ìý | $ | 324 | Ìý | Ìý | $ | 104 | Ìý |
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| Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
| Ìý | Ìý | | Ìý | Ìý | | Ìý | | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Net actuarial loss | Ìý | $ | (1,246 | ) | Ìý | $ | (1,485 | ) | | Prior service cost | Ìý | Ìý | — | Ìý | Ìý | Ìý | — | Ìý | | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Amounts recognized in accumulated other comprehensive income (loss), before taxes
| Ìý | Ìý | (1,246 | ) | Ìý | Ìý | (1,485 | ) | | Income tax benefit | Ìý | Ìý | 442 | Ìý | Ìý | Ìý | 525 | Ìý | Amounts recognized in accumulated other comprehensive income (loss), after taxes
| Ìý | $ | (804 | ) | Ìý | $ | (960 | ) |
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| Schedule of Net Benefit Costs [Table Text Block] |
| Ìý | Ìý | | Ìý | Ìý | | Ìý | Ìý | | Ìý | | Components of net periodic benefit cost: | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Service cost | Ìý | $ | 147 | Ìý | Ìý | $ | 153 | Ìý | Ìý | $ | 160 | Ìý | | Interest cost | Ìý | Ìý | 201 | Ìý | Ìý | Ìý | 215 | Ìý | Ìý | Ìý | 200 | Ìý | | Expected return on plan assets | Ìý | Ìý | (339 | ) | Ìý | Ìý | (311 | ) | Ìý | Ìý | (296 | ) | | | Ìý | Ìý | 108 | Ìý | Ìý | Ìý | 140 | Ìý | Ìý | Ìý | 144 | Ìý | | Amortization of prior service cost | Ìý | Ìý | — | Ìý | Ìý | Ìý | — | Ìý | Ìý | Ìý | 3 | Ìý | | Net periodic benefit cost | Ìý | $ | 117 | Ìý | Ìý | $ | 197 | Ìý | Ìý | $ | 211 | Ìý |
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| Schedule of Changes in Projected Benefit Obligations [Table Text Block] |
| Ìý | Ìý | | Ìý | Ìý | | Ìý | Ìý | | Ìý | Net actuarial (gain) loss
| Ìý | $ | (132 | ) | Ìý | $ | (305 | ) | Ìý | $ | (12 | ) | | Recognized actuarial loss | Ìý | Ìý | (108 | ) | Ìý | Ìý | (140 | ) | Ìý | Ìý | (144 | ) | | Recognized prior service cost | Ìý | Ìý | — | Ìý | Ìý | Ìý | — | Ìý | Ìý | Ìý | (4 | ) | Total recognized in other comprehensiveÌý income, before taxes
| Ìý | $ | (240 | ) | Ìý | $ | (445 | ) | Ìý | $ | (160 | ) | Total recognized in net benefit cost andÌý other comprehensive income, before taxes
| Ìý | $ | (123 | ) | Ìý | $ | (248 | ) | Ìý | $ | 51 | Ìý |
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| Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] |
| Ìý | Ìý | | Ìý | Ìý | | Ìý | Plan assets in excess of projected benefit obligation :
| Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Projected benefit obligation | Ìý | $ | 5,032 | Ìý | Ìý | $ | 4,833 | Ìý | | Fair value of plan assets | Ìý | $ | 5,356 | Ìý | Ìý | $ | 4,937 | Ìý | | Plan assets in excess of accumulated benefit obligation: | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Accumulated benefit obligation | Ìý | $ | 4,510 | Ìý | Ìý | $ | 4,366 | Ìý | | Fair value of plan assets | Ìý | $ | 5,356 | Ìý | Ìý | $ | 4,937 | Ìý |
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| Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
| Ìý | Ìý | | Ìý | Ìý | | Ìý | Ìý | | Ìý | | Weighted average assumptions used to determine benefit obligations as of December 31: | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Discount rate | Ìý | Ìý | 3.75% | Ìý | Ìý | Ìý | 4.25% | Ìý | Ìý | Ìý | 4.50% | Ìý | | Rate of compensation increase | Ìý | Ìý | 7.29% | Ìý | Ìý | Ìý | 7.29% | Ìý | Ìý | Ìý | 7.29% | Ìý | | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Weighted average assumptions used to determine benefit costs for the years ended December 31: | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Discount rate | Ìý | Ìý | 4.25% | Ìý | Ìý | Ìý | 4.50% | Ìý | Ìý | Ìý | 4.00% | Ìý | | Expected return on plan assets | Ìý | Ìý | 7.00% | Ìý | Ìý | Ìý | 7.00% | Ìý | Ìý | Ìý | 7.00% | Ìý | | Rate of compensation increase | Ìý | Ìý | 7.29% | Ìý | Ìý | Ìý | 7.29% | Ìý | Ìý | Ìý | 7.29% | Ìý |
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| Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
| Ìý | Ìý | | Ìý | Ìý | | Ìý | Ìý | | Ìý | Ìý | | Ìý | | | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Cash and Cash Equivalents | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Money Markets | Ìý | $ | 165 | Ìý | Ìý | $ | 165 | Ìý | Ìý | $ | — | Ìý | Ìý | $ | — | Ìý | | Equities | Ìý | Ìý | 670 | Ìý | Ìý | Ìý | 670 | Ìý | Ìý | Ìý | — | Ìý | Ìý | Ìý | — | Ìý | | Mutual Funds | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | | Ìý | Ìý | 2,468 | Ìý | Ìý | Ìý | 2,468 | Ìý | Ìý | Ìý | — | Ìý | Ìý | Ìý | — | Ìý | | Fixed Income Funds | Ìý | Ìý | 2,053 | Ìý | Ìý | Ìý | 2,053 | Ìý | Ìý | Ìý | — | Ìý | Ìý | Ìý | — | Ìý | | Total | Ìý | $ | 5,356 | Ìý | Ìý | $ | 5,356 | Ìý | Ìý | $ | — | Ìý | Ìý | $ | — | Ìý | | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Cash and Cash Equivalents | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Money Markets | Ìý | $ | 1,048 | Ìý | Ìý | $ | 1,048 | Ìý | Ìý | $ | — | Ìý | Ìý | $ | — | Ìý | | Equities | Ìý | Ìý | 445 | Ìý | Ìý | Ìý | 445 | Ìý | Ìý | Ìý | — | Ìý | Ìý | Ìý | — | Ìý | | Mutual Funds | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | | Ìý | Ìý | 1,684 | Ìý | Ìý | Ìý | 1,684 | Ìý | Ìý | Ìý | — | Ìý | Ìý | Ìý | — | Ìý | | Fixed Income Funds | Ìý | Ìý | 1,760 | Ìý | Ìý | Ìý | 1,760 | Ìý | Ìý | Ìý | — | Ìý | Ìý | Ìý | — | Ìý | | Total | Ìý | $ | 4,937 | Ìý | Ìý | $ | 4,937 | Ìý | Ìý | $ | — | Ìý | Ìý | $ | — | Ìý |
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| Schedule of Expected Benefit Payments [Table Text Block] |
| | Ìý | | Ìý | | | Ìý | $ | 244 | Ìý | | | Ìý | Ìý | 266 | Ìý | | | Ìý | Ìý | 279 | Ìý | | | Ìý | Ìý | 272 | Ìý | | | Ìý | Ìý | 264 | Ìý | | 2023 to 2027 | Ìý | Ìý | 1,213 | Ìý |
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