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Note 13 - Employee Benefits - Non-vested Option Awards Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Granted, shares (in shares) | 41,500 |  |
Granted, weighted average grant date fair value (in dollars per share) | $ 3.85 | $ 3.93 | $ 4.13
Forfeited, shares (in shares) | (12,300) |  |
Service Based Options [Member] |  |  |
Nonvested, shares (in shares) | 477,980 |  |
Nonvested, weighted average grant date fair value (in dollars per share) | $ 3.45 |  |
Nonvested, weighted average remaining contractual life (Year) | 4 years 9 months 18 days | 5 years 1 month 6 days |
Granted, shares (in shares) | 41,500 |  |
Granted, weighted average grant date fair value (in dollars per share) | $ 3.85 |  |
Granted, weighted average remaining contractual life (Year) | 6 years 4 months 24 days |  |
Vested, shares (in shares) | (175,818) |  |
Vested, weighted average grant date fair value (in dollars per share) | $ 3.07 |  |
Vested, weighted average remaining contractual life (Year) | 3 years 2 months 12 days |  |
Forfeited, shares (in shares) | (11,100) |  |
Forfeited, weighted average grant date fair value (in dollars per share) | $ 3.43 |  |
Forfeited, weighted average remaining contractual life (Year) | 4 years 3 months 18 days |  |
Nonvested, shares (in shares) | 332,562 | 477,980 |
Nonvested, weighted average grant date fair value (in dollars per share) | $ 3.71 | $ 3.45 |

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- Definition Sharebased compensation arrangement by sharebased payment award options forfeited weighted average remaining contractual term2. + References No definition available. + Details
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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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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