Note 10 - Stockholders' Equity (Details Textual) - USD ($)		12 Months Ended
	May 05, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Aug. 02, 2021
Capital Units, Authorized (in shares)		620,000,000
Common Stock, Shares Authorized (in shares)		600,000,000	600,000,000
Preferred Stock, Shares Authorized (in shares)		20,000,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)		0	0
Stock Repurchase Program, Authorized Amount					$ 50,000,000
Stock Repurchased During Period, Value		$ 13,006,331	$ 26,021,519	$ 28,502,946
Preferred Stock, Shares Issued (in shares)		0	0
Special Dividend [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.45
Dividends, Total	$ 32,900,000
New Repurchase Authorization [Member]
Stock Repurchase Program, Authorized Amount					$ 50,000,000
Stock Repurchased During Period, Shares (in shares)		1,800,000
Stock Repurchased During Period, Value		$ 13,000,000.0