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Note 14 - Stock-based Compensation - Nonvested Option Awards Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Options granted, shares (in shares) | 1,952,000 | 1,982,500
Options granted, weighted average exercise price (in dollars per share) | $ 2.82 | $ 4.48
Options forfeited, weighted average exercise price (in dollars per share) | $ 1.30 |
Share-Based Payment Arrangement, Option [Member] |  |
Nonvested, shares (in shares) | 952,500 | 235,000
Nonvest, weighted average exercise price (in dollars per share) | $ 4.08 | $ 0.64
Nonvested, weighted average grant date fair value (in dollars per share) | $ 1.51 | $ 0.36
Options granted, shares (in shares) | 1,952,000 | 1,982,500
Options granted, weighted average exercise price (in dollars per share) | $ 2.82 | $ 4.48
Granted, weighted average grant date fair value (in dollars per share) | $ 1.36 | $ 1.55
Vested, shares (in shares) | (513,750) | (1,265,000)
Vested, weighted average exercise price (in dollars per share) | $ 3.90 | $ 4.07
Vested, weighted average grant date fair value (in dollars per share) | $ 1.47 | $ 1.35
Forfeited, shares (in shares) | (35,000) |
Options forfeited, weighted average exercise price (in dollars per share) | $ 1.30 |
Forfeited, weighted average grant date fair value (in dollars per share) | $ 0.62 |
Nonvested, shares (in shares) | 2,355,750 | 952,500
Nonvest, weighted average exercise price (in dollars per share) | $ 3.11 | $ 4.08
Nonvested, weighted average grant date fair value (in dollars per share) | $ 1.32 | $ 1.51

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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=128089324&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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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