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Note 13 - Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Net Funded Status [Table Text Block] |
|  | December 31, |
|  | 2018 |  |  | 2017 |
(Amounts in thousands) |  |  |  |  |  |  |  |
Beginning balance |  | $ | 9,635 |  |  | $ | 9,181 |
Plan change |  |  | - |  |  |  | 258 |
Service cost |  |  | 245 |  |  |  | 231 |
Interest cost |  |  | 358 |  |  |  | 372 |
Actuarial gain |  |  | (565 | ) |  |  | (48 | )
Benefits paid |  |  | (408 | ) |  |  | (359 | )
Ending balance |  | $ | 9,265 |  |  | $ | 9,635 |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Year Ended December 31, |  |
|  | 2018 |  |  | 2017 |  |  | 2016 |  | Income Statement Location
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 245 |  |  | $ | 231 |  |  | $ | 184 |  | Salaries and employee benefits
Interest cost |  |  | 358 |  |  |  | 372 |  |  |  | 382 |  | Other expense
Amortization of prior service cost |  |  | 228 |  |  |  | 228 |  |  |  | 226 |  | Other expense
Amortization of losses |  |  | 57 |  |  |  | 31 |  |  |  | 47 |  | Other expense
Net periodic cost |  | $ | 888 |  |  | $ | 862 |  |  | $ | 839 |  |
Assumed discount rate |  |  | 4.28 | % |  |  | 3.85 | % |  |  | 4.22 | % |
Schedule of Expected Benefit Payments [Table Text Block] |
(Amounts in thousands) |  |  |  |
2019 |  | $ | 478 |
2020 |  |  | 578 |
2021 |  |  | 635 |
2022 |  |  | 635 |
2023 |  |  | 634 |
2024 through 2028 |  |  | 3,391 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  |  | Year Ended December 31, |
|  |  | 2018 |  |  | 2017 |  |  | 2016 |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax compensation expense |  | $ | 1,158 |  |  | $ | 790 |  |  | $ | 531 |
Excess tax benefit |  |  | 95 |  |  |  | 17 |  |  |  | 174 |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  |  |  |  |  | Weighted Average |  |  | Weighted Average |  |  | Aggregate |
|  | Option |  |  | Exercise Price |  |  | Remaining Contractual |  |  | Intrinsic |
(Amounts in thousands, |  | Shares |  |  | Per Share |  |  | Term (Years) |  |  | Value |
except share and per share data) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, January 1, 2018 |  |  | 200,704 |  |  | $ | 20.14 |  |  |  |  |  |  |  |  |
Granted |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Exercised |  |  | (24,186 | ) |  |  | 15.89 |  |  |  |  |  |  |  |  |
Canceled |  |  | (20,263 | ) |  |  | 19.72 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2018 |  |  | 156,255 |  |  | $ | 20.85 |  |  |  | 5.6 |  |  | $ | 1,662 |
Exercisable, December 31, 2018 |  |  | 103,090 |  |  | $ | 20.23 |  |  |  | 4.6 |  |  | $ | 1,160 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |
Stock options granted |  |  | 22,849 |  |  |  | 32,768 |
Grant-date fair value per share |  | $ | 5.79 |  |  | $ | 4.01 |
Volatility |  |  | 27.86 | % |  |  | 25.04 | %
Risk-free rate |  |  | 2.17 | % |  |  | 1.56 | %
Expected dividend yield |  |  | 2.99 | % |  |  | 3.09 | %
Expected term (in years) |  |  | 6.50 |  |  |  | 6.50 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  |  |  |  |  | Weighted Average |
|  | Shares |  |  | Grant-Date Fair Value |
Nonvested, January 1, 2018 |  |  | 43,606 |  |  | $ | 23.49 |
Granted |  |  | 41,339 |  |  |  | 30.08 |
Vested |  |  | (33,832 | ) |  |  | 25.69 |
Canceled |  |  | - |  |  |  | - |
Nonvested, December 31, 2018 |  |  | 51,113 |  |  | $ | 27.37 |

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