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Note 10 - Stockholders' Equity (Details Textual) - USD ($)				12 Months Ended
	Feb. 22, 2022	Aug. 04, 2021	Jul. 16, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock, Shares Authorized (in shares)				37,000,000	37,000,000
Preferred Stock, Shares Authorized (in shares)				3,000,000	3,000,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)				0	0
Stock Issued During Period, Shares, New Issues (in shares)			1,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.01	$ 0.01	$ 0.01
Shares Issued, Price Per Share (in dollars per share)			$ 54.50
Stock Issued During Period, Value, New Issues			$ 51,000,000.0	$ 58,695,000
Proceeds from Issuance of Common Stock				$ 63,241,000	$ 5,971,000	$ 4,856,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)				5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)				7,118,003
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)				658,935
Proceeds from Stock Options Exercised				$ 4,500,000	$ 6,000,000.0	$ 4,900,000
Common Stock, Dividends, Per Share, Declared (in dollars per share)				$ 0.44	$ 0.38	$ 0.34
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.125
Dividends Payable	$ 2,700,000
Dividends Payable, Date to be Paid	Mar. 24, 2022
Dividends Payable, Date of Record	Mar. 08, 2022
Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)				1,150,000
Stock Issued During Period, Value, New Issues				$ 12,000
Treasury Stock, Shares, Acquired (in shares)
Stock Repurchase Program [Member] \| Common Stock [Member]
Treasury Stock, Shares, Acquired (in shares)				0
Stock Repurchase Program [Member] \| Common Stock [Member] \| Subsequent Event [Member]
Stock Repurchase Program, Authorized Amount	$ 20,000,000.0
Share-based Payment Arrangement, Option [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				4 years
Share-based Payment Arrangement, Option [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				5 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value				$ 2,500,000	$ 1,800,000	$ 2,100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total				$ 13,100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				3 years 3 months 18 days
Underwriters [Member]
Stock Issued During Period, Value, New Issues		$ 150,000
Proceeds from Issuance of Common Stock		$ 7,600,000