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Note 7 - Common Stock Options - Changes in Common Stock Options Issued (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Options outstanding (in shares) | 5,327,425 | 6,965,730 | 5,535,439
Granted (in shares) | 809,500 | 230,500 | 2,563,500
Exercised (in shares) | (1,348,374) | (1,784,763) | (771,376)
Forfeitures (in shares) | (131,874) | (84,042) | (361,833)
Options outstanding (in shares) | 4,656,677 | 5,327,425 | 6,965,730
Minimum [Member] |  |  |
Options outstanding, exercise price (in dollars per share) | $ 2.71 | $ 2.71 | $ 2.50
Granted, exercise price (in dollars per share) | 11.35 | 8.89 | 5.15
Exercised, exercise price (in dollars per share) | 3.27 | 2.71 | 2.5
Forfeitures, exercise price (in dollars per share) | 4.14 | 4.26 | 2.50
Options outstanding, exercise price (in dollars per share) | 2.71 | 2.71 | 2.71
Maximum [Member] |  |  |
Options outstanding, exercise price (in dollars per share) | 21.99 | 21.99 | 21.99
Granted, exercise price (in dollars per share) | 20.20 | 21.80 | 19.87
Exercised, exercise price (in dollars per share) | 15.00 | 19.09 | 15
Forfeitures, exercise price (in dollars per share) | 21.99 | 21.80 | 16.50
Options outstanding, exercise price (in dollars per share) | 21.74 | 21.99 | 21.99
Weighted Average [Member] |  |  |
Options outstanding, exercise price (in dollars per share) | 6.09 | 6.09 | 7.30
Granted, exercise price (in dollars per share) | 13.47 | 16.85 | 9.36
Exercised, exercise price (in dollars per share) | 7.78 | 6.08 | 4.62
Forfeitures, exercise price (in dollars per share) | 12.23 | 8.55 | 7.53
Options outstanding, exercise price (in dollars per share) | $ 10.68 | $ 6.09 | $ 6.09

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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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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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of net share options (or share units) exercised during the current period + References No definition available. + Details
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