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Note 19 - Stock-based Compensation (Details Textual) - USD ($)		3 Months Ended		12 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)							500,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)				282,000
Proceeds (Used for) and Received from Settlement of Stock Awards				$ 233,000	$ 208,000
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				101,000
Share-based Compensation Arrangement by Share-based Payment Award, Expected Shares to be Awarded (in shares)				164,000
Stock Appreciation Rights (SARs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	[1]			282,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				10 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				34,000	30,000	48,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)				435,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Exercise Price (in dollars per share)				$ 35.60
Stock Appreciation Rights (SARs) [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Exercise Price (in dollars per share)				19.37	$ 15.24	$ 15.24		$ 14.02
Stock Appreciation Rights (SARs) [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Exercise Price (in dollars per share)				$ 74.92	$ 50.71	$ 40.00		$ 40.00
Stock Appreciation Rights (SARs) [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				20.00%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				35,000	39,000	36,000
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				96,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				3 years
Sharebased Compensation Arrangement by Share-based Payment Award Post Vesting Holding Period (Year)				1 year
Share-based Compensation Arrangement by Share-based Payment Award Liquidity Discount				5.80%	6.10%	4.40%
Performance Shares [Member] | Minimum [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				0
Performance Shares [Member] | Maximum [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				164,000
Restricted Stock Units (RSUs) [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				5,000
Restricted Stock Units (RSUs) [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				12 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		5,410	7,758
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Fair Value Granted		$ 350,000	$ 315,000
[1] Under the 2015 Omnibus Equity Compensation Plan, shares of stock are authorized for issuance as incentive and non-qualified stock options, SARs, RSAs, and RSUs.

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