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Note 16 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
​ | ​ | (dollars in thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options | ​ | $ | 297 | ​ | $ | 475 | ​ | $ | 472
Restricted stock awards | ​ | ​ | 1,619 | ​ | ​ | 1,850 | ​ | ​ | 857
Stock purchase plan | ​ |  | 234 | ​ |  | 144 | ​ |  | 114
​ | ​ | $ | 2,150 | ​ | $ | 2,469 | ​ | $ | 1,443
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Summary of the stock option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2020 | ​ | 2019 | ​ | 2018
​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | ​ | Exercise
​ |  | Shares |  | Price |  | Shares |  | Price |  | Shares |  | Price
Outstanding, beginning | ​ | ​ | 426,913 | ​ | $ | 20.14 | ​ | ​ | 469,572 | ​ | $ | 18.52 | ​ | ​ | 513,554 | ​ | $ | 17.13
Granted |  | ​ | 23,350 | ​ |  | 39.12 |  | ​ | 20,200 | ​ |  | 36.00 |  | ​ | 16,315 | ​ |  | 44.02
Exercised |  | ​ | (41,650) | ​ |  | 10.67 |  | ​ | (59,393) | ​ |  | 12.11 |  | ​ | (60,127) | ​ |  | 13.56
Forfeited |  | ​ | (850) | ​ |  | 19.94 |  | ​ | (3,466) | ​ |  | 31.59 |  | ​ | (170) | ​ |  | 16.81
Outstanding, ending |  | ​ | 407,763 | ​ |  | 22.24 |  | ​ | 426,913 | ​ |  | 20.14 |  | ​ | 469,572 | ​ |  | 18.52
​ |  | ​ |  | ​ |  |  |  | ​ |  | ​ |  |  |  | ​ |  | ​ |  |
Exercisable, ending |  | ​ | 354,899 | ​ |  |  |  | ​ | 365,084 | ​ |  |  |  | ​ | 358,270 | ​ |  |
​ |  | ​ |  | ​ |  |  |  | ​ |  | ​ |  |  |  | ​ |  | ​ |  |
Weighted average fair value per option granted | ​ | $ | 10.07 | ​ |  |  | ​ | $ | 11.29 | ​ |  |  | ​ | $ | 14.68 | ​ |  |
Summary of options outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options Outstanding | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | Options Exercisable
​ | ​ | ​ | ​ | Average | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Remaining | ​ | Average | ​ | ​ | ​ | Average
Range of | ​ | Number | ​ | Contractual | ​ | Exercise | ​ | Number | ​ | Exercise
Exercise Prices |  | Outstanding |  | Life |  | Price |  | Exercisable |  | Price
$7.99 to $8.93 | ​ | 11,325 | ​ | 0.14 | ​ | $ | 8.15 | ​ | 11,325 | ​ | $ | 8.15
$9.00 to $9.30 |  | 60,328 |  | 1.08 | ​ |  | 9.30 |  | 60,328 | ​ |  | 9.30
$15.50 to $15.65 |  | 66,491 |  | 2.24 | ​ |  | 15.64 |  | 66,491 | ​ |  | 15.64
$17.10 to $18.00 |  | 113,527 |  | 3.56 | ​ |  | 17.31 |  | 113,527 | ​ |  | 17.31
$21.71 to $22.64 |  | 58,115 |  | 5.22 | ​ |  | 22.88 |  | 56,115 | ​ |  | 22.63
$36.00 to $48.50 |  | 97,977 |  | 7.39 | ​ |  | 41.45 |  | 47,113 | ​ |  | 42.98
​ |  | 407,763 |  |  | ​ |  |  |  | 354,899 | ​ |  |
Summary of changes in nonvested restricted stock awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019 |  | 2018
Outstanding, beginning | ​ | ​ | 106,826 | ​ | ​ | 64,099 | ​ | ​ | 46,389
Granted* | ​ |  | 34,559 | ​ |  | 85,961 | ​ |  | 37,315
Released | ​ |  | (37,296) | ​ |  | (37,624) | ​ |  | (19,605)
Forfeited | ​ |  | (1,600) | ​ |  | (5,610) | ​ |  | —
Outstanding, ending | ​ | ​ | 102,489 | ​ | ​ | 106,826 | ​ | ​ | 64,099
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average fair value per share granted | ​ | $ | 39.39 | ​ | $ | 20.14 | ​ | $ | 43.50
​ * At December 31, 2020, includes 8,913 shares of restricted stock, 25,646 restricted stock units. At December 31, 2019, includes 18,634 shares of restricted stock, 49,269 restricted stock units and 18,058 performance share units. At December 31, 2018, includes 22,660 shares of restricted stock and 14,655 restricted stock units. ​
Schedule of Stock purchase plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Shares granted |  | ​ | 38,738 |  | ​ | 29,882 |  | ​ | 17,305
Shares purchased |  | ​ | 37,114 |  | ​ | 28,775 |  | ​ | 15,528
Weighted average fair value per share granted | ​ | $ | 6.01 | ​ | $ | 4.81 | ​ | $ | 6.63

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