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Note 11 - Share-based Incentive Plan (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Jan. 23, 2012 | Dec. 31, 2006
Shares Issued, Price Per Share (in dollars per share) |  |  | $ 19.00 |
Share-based Payment Arrangement, Expense | $ 1.6 | $ 1.2 |  |
Restricted Stock [Member] |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  | $ 20.00
Nonvested Resctricted Stock [Member] |  |  |  |
Restricted Stock, Value, Shares Issued Net of Tax Withholdings | $ 1.6 | $ 1.1 |  |
Minimum [Member] | Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years |  |  |
Minimum [Member] | Nonvested Resctricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 1 year |  |  |
Maximum [Member] | Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 10 years |  |  |
Maximum [Member] | Nonvested Resctricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 6 years |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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