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Note 10 - Stock-based Compensation Plan - Stock Option Activity (Details) | 3 Months Ended
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Mar. 31, 2021 $ / shares shares
Options outstanding, number of shares (in shares) | shares | 438,200
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares | $ 6.25
Granted, number of shares (in shares) | shares | 164,800
Granted, weighted average exercise price (in dollars per share) | $ / shares | $ 10.62
Exercised, number of shares (in shares) | shares | 99,740
Exercised, weighted average exercise price (in dollars per share) | $ / shares | $ 7.19
Options outstanding, number of shares (in shares) | shares | 503,260
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares | $ 7.49

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- Definition Number of options outstanding, including both vested and non-vested options. + 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=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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