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Note 6 - Share-based Payments (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity [Table Text Block] |
Directors’ Restricted Stock Awards |  | 2019 |  |  | 2018 |  |  | 2017 |
|  | Shares |  |  | Weighted Average Grant-Date Fair Value |  |  | Shares |  |  | Weighted Average Grant-Date Fair Value |  |  | Shares |  |  | Weighted Average Grant-Date Fair Value |
Nonvested, Beginning of Year |  |  | 43,225 |  |  | $ | 37.53 |  |  |  | 46,800 |  |  | $ | 32.65 |  |  |  | 46,334 |  |  | $ | 29.71 |
Granted |  |  | 15,700 |  |  |  | 49.73 |  |  |  | 18,200 |  |  |  | 43.40 |  |  |  | 17,600 |  |  |  | 37.75 |
Vested |  |  | 18,320 |  |  |  | 36.02 |  |  |  | 21,775 |  |  |  | 31.94 |  |  |  | 17,134 |  |  |  | 29.93 |
Forfeited |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |
Nonvested, End of Year |  |  | 40,605 |  |  |  | 42.93 |  |  |  | 43,225 |  |  |  | 37.53 |  |  |  | 46,800 |  |  |  | 32.65 |
Compensation Expense Recognized |  |  |  |  |  | $ | 776,000 |  |  |  |  |  |  | $ | 661,000 |  |  |  |  |  |  | $ | 658,000 |
Fair Value of Shares Vested in Year |  |  |  |  |  | $ | 660,000 |  |  |  |  |  |  | $ | 696,000 |  |  |  |  |  |  | $ | 513,000 |
Schedule of Share-based Compensation, Restricted Stock Activity [Table Text Block] |
Employees’ Restricted Stock Awards |  | 2019 |  |  | 2018 |  |  | 2017 |
|  | Shares |  |  | Weighted Average Grant-Date Fair Value |  |  | Shares |  |  | Weighted Average Grant-Date Fair Value |  |  | Shares |  |  | Weighted Average Grant-Date Fair Value |
Nonvested, Beginning of Year |  |  | - |  |  |  | - |  |  |  | 2,895 |  |  | $ | 29.41 |  |  |  | 7,180 |  |  | $ | 29.72 |
Granted |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |
Vested |  |  | - |  |  |  | - |  |  |  | 2,895 |  |  |  | 29.41 |  |  |  | 4,285 |  |  |  | 29.94 |
Forfeited |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |
Nonvested, End of Year |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 2,895 |  |  |  | 29.41 |
Compensation Expense Recognized |  |  |  |  |  | $ | - |  |  |  |  |  |  | $ | 16,000 |  |  |  |  |  |  | $ | 70,000 |
Fair Value of Awards Vested |  |  |  |  |  | $ | - |  |  |  |  |  |  | $ | 85,000 |  |  |  |  |  |  | $ | 128,000 |
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
Employees’ Restricted Stock Unit Awards |  | 2019 |  |  | 2018 |  |  | 2017 |
|  | Restricted Stock Units |  |  | Weighted Average Grant-Date Fair Value |  |  | Restricted Stock Units |  |  | Weighted Average Grant-Date Fair Value |  |  | Restricted Stock Units |  |  | Weighted Average Grant-Date Fair Value |
Nonvested, Beginning of Year |  |  | 49,470 |  |  | $ | 31.03 |  |  |  | 46,440 |  |  | $ | 27.07 |  |  |  | 47,370 |  |  | $ | 25.19 |
Granted |  |  | 13,270 |  |  |  | 44.45 |  |  |  | 14,780 |  |  |  | 38.99 |  |  |  | 10,995 |  |  |  | 33.28 |
Vested |  |  | 13,250 |  |  |  | 27.62 |  |  |  | 8,925 |  |  |  | 25.23 |  |  |  | 11,550 |  |  |  | 25.30 |
Forfeited |  |  | 1,900 |  |  |  | 34.57 |  |  |  | 2,825 |  |  |  | 25.86 |  |  |  | 375 |  |  |  | 26.92 |
Nonvested, End of Year |  |  | 47,590 |  |  |  | 35.58 |  |  |  | 49,470 |  |  |  | 31.03 |  |  |  | 46,440 |  |  |  | 27.07 |
Compensation Expense Recognized |  |  |  |  |  | $ | 427,000 |  |  |  |  |  |  | $ | 351,000 |  |  |  |  |  |  | $ | 331,000 |
Fair Value of Awards Vested |  |  |  |  |  | $ | 366,000 |  |  |  |  |  |  | $ | 225,000 |  |  |  |  |  |  | $ | 292,000 |
Executive Officers and Key Employees [Member] |
Notes Tables |
Schedule of Share-based Compensation, Restricted Stock Activity [Table Text Block] |
Dividend Equivalent Restricted Stock Unit Awards |  | 2019 |  |  | 2018 |  |  | 2017 |
|  | Shares |  |  | Weighted Average Grant-Date Fair Value |  |  | Shares |  |  | Weighted Average Grant-Date Fair Value |  |  | Shares |  |  | Weighted Average Grant-Date Fair Value |
Nonvested, Beginning of Year |  |  | 45,300 |  |  | $ | 35.70 |  |  |  | 47,750 |  |  | $ | 32.71 |  |  |  | 41,825 |  |  | $ | 30.23 |
Granted |  |  | 16,200 |  |  |  | 49.72 |  |  |  | 15,200 |  |  |  | 41.325 |  |  |  | 15,900 |  |  |  | 37.65 |
Vested |  |  | 15,850 |  |  |  | 34.46 |  |  |  | 17,650 |  |  |  | 32.462 |  |  |  | 9,975 |  |  |  | 30.16 |
Forfeited |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |
Nonvested, End of Year |  |  | 45,650 |  |  |  | 41.10 |  |  |  | 45,300 |  |  |  | 35.70 |  |  |  | 47,750 |  |  |  | 32.71 |
Compensation Expense Recognized |  |  |  |  |  | $ | 1,055,000 |  |  |  |  |  |  | $ | 769,000 |  |  |  |  |  |  | $ | 576,000 |
Fair Value of Awards Vested |  |  |  |  |  | $ | 546,000 |  |  |  |  |  |  | $ | 573,000 |  |  |  |  |  |  | $ | 301,000 |
Stock Performance Awards [Member] |
Notes Tables |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
Performance Period |  |  | Maximum Shares Subject To Award |  |  | Target Shares |  |  | Expense Recognized in the Year Ended December 31, |  |  | Earned Shares |
|  |  |  |  |  |  |  |  |  |  | 2019 |  |  | 2018 |  |  | 2017 |  |  |  |  |
2019-2021 |  |  |  | 83,400 |  |  |  | 55,600 |  |  | $ | 2,168,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2018-2020 |  |  |  | 81,000 |  |  |  | 54,000 |  |  |  | 897,000 |  |  | $ | 1,121,000 |  |  |  |  |  |  |  |  |
2017-2019 |  |  |  | 89,250 |  |  |  | 59,500 |  |  |  | 524,000 |  |  |  | 729,000 |  |  | $ | 854,000 |  |  |  | 69,997 |
2016-2018 |  |  |  | 122,250 |  |  |  | 81,500 |  |  |  | 8,000 |  |  |  | 772,000 |  |  |  | 580,000 |  |  |  | 113,298 |
2015-2017 |  |  |  | 126,450 |  |  |  | 84,300 |  |  |  | - |  |  |  | 23,000 |  |  |  | 573,000 |  |  |  | 114,648 |
Total |  |  |  |  |  |  |  |  |  |  | $ | 3,597,000 |  |  | $ | 2,645,000 |  |  | $ | 2,007,000 |  |  |  | 297,943 |

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