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Note 10 - Stock Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  | 20 20 |  |  | 201 9 |
Options outstanding at January 1 |  |  |  |  | 126,500 |  |  |  |  |  | 207,500 |
Options cancelled |  |  |  |  | - |  |  |  |  |  | (16,000 | )
Options exercised |  |  |  |  | - |  |  |  |  |  | (107,000 | )
Options granted |  |  |  |  | - |  |  |  |  |  | 42,000 |
Options outstanding at December 31 |  |  |  |  | 126,500 |  |  |  |  |  | 126,500 |
Options available for grant at December 31 |  |  |  |  | 885,620 |  |  |  |  |  | 763,000 |
Options exercisable at December 31 |  |  |  |  | 102,500 |  |  |  |  |  | 84,500 |
Exercise price ranges per share: |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  | N/A |  |  |  | $19.99 | - | $39.11 |
Exercised |  |  |  |  | N/A |  |  |  | $0.69 | - | $7.80 |
Outstanding |  |  | $1.52 | - | $39.11 |  |  |  | $1.52 | - | $39.11 |
Weighted average exercise price per share: |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  | - |  |  | $ |  |  | 25.45 |
Exercised |  |  |  |  | - |  |  | $ |  |  | 1.97 |
Outstanding at December 31 |  | $ |  |  | 8.94 |  |  | $ |  |  | 8.94 |
Exercisable at December 31 |  | $ |  |  | 5.61 |  |  | $ |  |  | 2.21 |
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
Options Outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |
Range of Exercise Price |  | Number Outstanding |  |  | Wgt. Avg. Contractual Life Remaining (in years) |  |  | Wgt. Avg. Exercise Price |  |  | Aggregate Intrinsic Value |
$1.52 | - | $1.72 |  |  | 67,500 |  |  |  | 0.5 |  |  | $ | 1.59 |  |  | $ | 2,600,325 |
$3.50 | - | $39.11 |  |  | 59,000 |  |  |  | 7.6 |  |  | $ | 17.35 |  |  | $ | 1,342,770 |
$1.52 | - | $39.11 |  |  | 126,500 |  |  |  | 3.8 |  |  | $ | 8.94 |  |  | $ | 3,943,095 |
Options Exercisable: |  |  |  |  |  |  |  |  |  |  |  |  |
Range of Exercise Price |  | Number Exercisable |  |  | Wgt. Avg. Contractual Life Remaining (in years) |  |  | Wgt. Avg. Exercise Price |  |  | Aggregate Intrinsic Value |
$1.52 | - | $1.72 |  |  | 67,500 |  |  |  | 0.5 |  |  | $ | 1.59 |  |  | $ | 2,600,325 |
$3.50 | - | $39.11 |  |  | 35,000 |  |  |  | 7.3 |  |  | $ | 13.36 |  |  | $ | 936,370 |
$1.52 | - | $39.11 |  |  | 102,500 |  |  |  | 2.8 |  |  | $ | 5.61 |  |  | $ | 3,536,695 |

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