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Note 8 - Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | December 31 , |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Change in benefit obligatio n |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 21,059 |  |  | $ | 20,427 |  |  | $ | 19,324 |
Service cost |  |  | 692 |  |  |  | 694 |  |  |  | 620 |
Interest cost |  |  | 743 |  |  |  | 757 |  |  |  | 669 |
Actuarial loss |  |  | 1,417 |  |  |  | 198 |  |  |  | 798 |
Benefits paid |  |  | (419 | ) |  |  | (1,017 | ) |  |  | (984 | )
Projected benefit obligation at end of year |  | $ | 23,492 |  |  | $ | 21,059 |  |  | $ | 20,427 |
Change in plan asset s |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 17,038 |  |  | $ | 16,131 |  |  | $ | 17,130 |
Actual return on plan assets |  |  | 2,302 |  |  |  | 1,113 |  |  |  | (155 | )
Employer contribution |  |  | 4,507 |  |  |  | 811 |  |  |  | 140 |
Benefits paid |  |  | (419 | ) |  |  | (1,017 | ) |  |  | (984 | )
Fair value of plan assets at end of year |  | $ | 23,428 |  |  | $ | 17,038 |  |  | $ | 16,131 |
Funded status at the end of the yea r |  | $ | (64 | ) |  | $ | (4,021 | ) |  | $ | (4,296 | )
Amounts recognized in the Consolidated Balance Shee t |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset |  | $ | 13 |  |  | $ | 1,407 |  |  | $ | 1,504 |
Other liabilities |  |  | (64 | ) |  |  | (4,021 | ) |  |  | (4,296 | )
Total amounts recognized in the Consolidated Balance Sheet |  | $ | (51 | ) |  | $ | (2,614 | ) |  | $ | (2,792 | )
Amounts recognized in accumulated other comprehensive (loss), ne t |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) |  | $ | (7,923 | ) |  | $ | (8,250 | ) |  | $ | (8,627 | )
Prior service cost |  |  | 340 |  |  |  | 449 |  |  |  | 559 |
Deferred tax asset |  |  | 1,592 |  |  |  | 2,730 |  |  |  | 2,798 |
Amount recognized |  | $ | (5,991 | ) |  | $ | (5,071 | ) |  | $ | (5,270 | )
Accrued/Prepaid benefit cost, ne t |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation |  | $ | (23,492 | ) |  | $ | (21,059 | ) |  | $ | (20,427 | )
Fair value of assets |  |  | 23,428 |  |  |  | 17,038 |  |  |  | 16,131 |
Unrecognized net actuarial loss |  |  | 7,923 |  |  |  | 8,250 |  |  |  | 8,627 |
Unrecognized prior service cost |  |  | (340 | ) |  |  | (449 | ) |  |  | (559 | )
Deferred tax liability |  |  | (1,579 | ) |  |  | (1,323 | ) |  |  | (1,294 | )
Prepaid benefit cost included in other assets |  | $ | 5,940 |  |  | $ | 2,457 |  |  | $ | 2,478 |
Components of net periodic benefit cos t |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 692 |  |  | $ | 694 |  |  | $ | 620 |
Interest cost |  |  | 743 |  |  |  | 757 |  |  |  | 669 |
Expected return on plan assets |  |  | (1,097 | ) |  |  | (1,110 | ) |  |  | (1,166 | )
Amortization of prior service cost |  |  | (110 | ) |  |  | (110 | ) |  |  | (110 | )
Recognized net actuarial loss |  |  | 540 |  |  |  | 572 |  |  |  | 414 |
Net periodic benefit cost |  | $ | 768 |  |  | $ | 803 |  |  | $ | 427 |
Other changes in plan assets and benefit obligations recognized in other comprehensive los s |  |  |  |  |  |  |  |  |  |  |  |
Net (gain) loss |  | $ | (328 | ) |  | $ | (377 | ) |  | $ | 1,705 |
Amortization of prior service cost |  |  | 110 |  |  |  | 110 |  |  |  | 110 |
Deferred income tax expense (benefit) |  |  | 46 |  |  |  | 93 |  |  |  | (635 | )
Total recognized |  | $ | (172 | ) |  | $ | (174 | ) |  | $ | 1,180 |
Total recognized in net periodic benefit cost and other comprehensive loss |  | $ | 550 |  |  | $ | 536 |  |  | $ | 2,242 |
Weighted average assumptions at end of the yea r |  |  |  |  |  |  |  |  |  |  |  |
Discount rate used for net periodic pension cost |  |  | 4.00 | % |  |  | 4.00 | % |  |  | 3.75 | %
Discount rate used for disclosure |  |  | 3.50 | % |  |  | 4.00 | % |  |  | 4.00 | %
Expected return on plan assets |  |  | 7.50 | % |  |  | 7.50 | % |  |  | 7.50 | %
Rate of compensation increase |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | %
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | Fair Value Measurements at December 31, 20 1 7 |
Asset Category |  | Total |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Cash |  | $ | 4,454 |  |  | $ | 4,454 |  |  | $ | --- |  |  | $ | --- |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. companies |  |  | 9,892 |  |  |  | 9,892 |  |  |  | --- |  |  |  | --- |
International companies |  |  | 106 |  |  |  | 106 |  |  |  | --- |  |  |  | --- |
Equities mutual funds (1) |  |  | 1,962 |  |  |  | 1,962 |  |  |  | --- |  |  |  | --- |
U. S. government agencies and corporations |  |  | 51 |  |  |  | --- |  |  |  | 51 |  |  |  | --- |
State and political subdivisions |  |  | 231 |  |  |  | --- |  |  |  | 231 |  |  |  | --- |
Corporate bonds – investment grade (2) |  |  | 6,732 |  |  |  | --- |  |  |  | 6,732 |  |  |  | --- |
Total pension plan assets |  | $ | 23,428 |  |  | $ | 16,414 |  |  | $ | 7,014 |  |  | $ | --- |
|  | Fair Value Measurements at December 31, 20 1 6 |
Asset Category |  | Total |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Cash |  | $ | 207 |  |  | $ | 207 |  |  | $ | --- |  |  | $ | --- |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. companies |  |  | 9,195 |  |  |  | 9,195 |  |  |  | --- |  |  |  | --- |
International companies |  |  | 116 |  |  |  | 116 |  |  |  | --- |  |  |  | --- |
Equities mutual funds (1) |  |  | 966 |  |  |  | 966 |  |  |  | --- |  |  |  | --- |
U. S. government agencies and corporations |  |  | 53 |  |  |  | --- |  |  |  | 53 |  |  |  | --- |
State and political subdivisions |  |  | 230 |  |  |  | --- |  |  |  | 230 |  |  |  | --- |
Corporate bonds – investment grade (2) |  |  | 6,271 |  |  |  | --- |  |  |  | 6,271 |  |  |  | --- |
Total pension plan assets |  | $ | 17,038 |  |  | $ | 10,484 |  |  | $ | 6,554 |  |  | $ | --- |
Schedule of Expected Benefit Payments [Table Text Block] |
201 8 |  |  |  | $ | 4,229 |
201 9 |  |  |  | $ | 1,060 |
2020 |  |  |  | $ | 1,630 |
202 1 |  |  |  | $ | 738 |
20 22 |  |  |  | $ | 1,277 |
2023 | - | 2027 |  | $ | 6,546 |

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