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Note 10 - Employee Benefits - Non-vested Option Awards Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Granted, shares (in shares) | 39,000 |  |
Granted, weighted average grant date fair value (in dollars per share) | $ 6.63 | $ 5.79 | $ 4.29
Forfeited, shares (in shares) | (9,300) |  |
Service Based Options [Member] |  |  |
Beginning of period, nonvested, shares (in shares) | 544,150 |  |
Beginning of period, nonvested, weighted average grant date fair value (in dollars per share) | $ 4.62 |  |
Nonvested, weighted average remaining contractual life (Year) | 5 years | 5 years 6 months |
Granted, shares (in shares) | 39,000 |  |
Granted, weighted average grant date fair value (in dollars per share) | $ 6.63 |  |
Granted, weighted average remaining contractual life (Year) | 6 years 7 months 6 days |  |
Vested, shares (in shares) | (167,550) |  |
Vested, weighted average grant date fair value (in dollars per share) | $ 4.44 |  |
Vested, weighted average remaining contractual life (Year) | 3 years 10 months 24 days |  |
Forfeited, shares (in shares) | (9,300) |  |
Forfeited, weighted average grant date fair value (in dollars per share) | $ 5.01 |  |
Forfeited, weighted average remaining contractual life (Year) | 5 years 2 months 12 days |  |
End of period, nonvested, shares (in shares) | 406,300 | 544,150 |
End of period, nonvested, weighted average grant date fair value (in dollars per share) | $ 4.88 | $ 4.62 |

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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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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