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Note 5 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				9 Months Ended
	Nov. 30, 2021	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2018	Sep. 30, 2022	Sep. 30, 2021	Mar. 14, 2022
Stock Repurchased During Period, Value			$ 3,143	$ 19,889
November 2021 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount	$ 20,000
Stock Repurchased During Period, Shares (in shares)	853,023					649,739
Stock Repurchased During Period, Value	$ 20,000					$ 14,900
Stock Repurchased Average Price per Share (in dollars per share)	$ 23.45					$ 22.92
March 2022 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount								$ 10,000
Stock Repurchased During Period, Shares (in shares)		0				402,050
Stock Repurchased During Period, Value						$ 8,100
Stock Repurchased Average Price per Share (in dollars per share)						$ 20.19
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						140,473	129,906
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)						$ 20.31	$ 23.44
Performance Based Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					70,000	91,042
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)					5 years	5 years
Share Based Compensation Arrangement By Share Based Payment Award Incremental Performance Percentage Year One						15.00%
Share Based Compensation Arrangement By Share Based Payment Award Incremental Performance Percentage Year Two						20.00%
Share Based Compensation Arrangement By Share Based Payment Award Incremental Performance Percentage Year Three						20.00%
Share Based Compensation Arrangement By Share Based Payment Award Incremental Performance Percentage Year Four						20.00%
Share Based Compensation Arrangement By Share Based Payment Award Incremental Performance Percentage Year Five						25.00%
Performance Based Restricted Stock Units (RSUs) [Member] | The 2018 June Issue [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)						$ 20.32
Performance Based Restricted Stock Units (RSUs) [Member] | Two Thousand Twenty Two Performance [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					21,000	13,654
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)						$ 20.29
Performance Based Restricted Stock Units (RSUs) [Member] | Not Based on 2022 Performance [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						77,388

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