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Note 10 - Stock Option Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | 201 9 |  |  | 201 8 |
Options outstanding at January 1 |  |  |  |  | 207,500 |  |  |  |  |  | 243,500 |
Options cancelled |  |  |  |  | (16,000 | ) |  |  |  |  | (8,000 | )
Options exercised |  |  |  |  | (107,000 | ) |  |  |  |  | (40,000 | )
Options granted |  |  |  |  | 42,000 |  |  |  |  |  | 12,000 |
Options outstanding at December 31 |  |  |  |  | 126,500 |  |  |  |  |  | 207,500 |
Options available for grant at December 31 |  |  |  |  | 763,000 |  |  |  |  |  | 805,000 |
Options exercisable at December 31 |  |  |  |  | 84,500 |  |  |  |  |  | 179,000 |
Exercise price ranges per share: |  |  |  |  |  |  |  |  |  |  |  |
Granted |  | $ | 19.99 | - | $39.11 |  |  | $ |  |  | 7.80 |
Exercised |  | $ | 0.69 | - | $ 7.80 |  |  | $ | 0.69 | - | $ 3.89 |
Outstanding |  | $ | 1.52 | - | $ 39.11 |  |  | $ | 0.69 | - | $ 7.80 |
Weighted average exercise price per share: |  |  |  |  |  |  |  |  |  |  |  |
Granted |  | $ |  |  | 25.45 |  |  | $ |  |  | 7.80 |
Exercised |  | $ |  |  | 1.97 |  |  | $ |  |  | 2.79 |
Outstanding at December 31 |  | $ |  |  | 8.94 |  |  | $ |  |  | 2.33 |
Exercisable at December 31 |  | $ |  |  | 2.21 |  |  | $ |  |  | 1.82 |
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 |  |  |  | 1.5 |  |  | $ | 1.59 |  |  | $ | 2,588,850 |
$3.50 | - | $39.11 |  |  | 59,000 |  |  |  | 8.6 |  |  | $ | 17.35 |  |  | $ | 1,332,740 |
$1.52 | - | $39.11 |  |  | 126,500 |  |  |  | 4.8 |  |  | $ | 8.94 |  |  | $ | 3,921,590 |
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 |  |  |  | 1.5 |  |  | $ | 1.59 |  |  | $ | 2,588,850 |
$3.50 | - | $7.80 |  |  | 17,000 |  |  |  | 7.5 |  |  | $ | 4.70 |  |  | $ | 599,040 |
$1.52 | - | $7.80 |  |  | 84,500 |  |  |  | 2.7 |  |  | $ | 2.21 |  |  | $ | 3,187,890 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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