Note 16 - Subsequent Events (Details Textual) - USD ($)				1 Months Ended																			12 Months Ended
	Aug. 25, 2022	May 25, 2022	Feb. 25, 2022	Feb. 29, 2024	Nov. 30, 2023	Oct. 31, 2023	Aug. 30, 2023	Jul. 31, 2023	May 31, 2023	Apr. 30, 2023	Feb. 28, 2023	Jan. 31, 2023	Nov. 30, 2022	Oct. 31, 2022	Aug. 31, 2022	Jul. 31, 2022	May 31, 2022	Apr. 30, 2022	Feb. 28, 2022	Jan. 31, 2022	Sep. 30, 2021	Jul. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Aug. 31, 2023
Common Stock, Dividends, Per Share, Declared																							$ 0.1	$ 0.1	$ 0.125
Dividends		$ 2,600,000	$ 2,400,000																		$ 2,300,000
Dividends Payable					$ 53,000
Quarterly Dividend [Member]
Common Stock, Dividends, Per Share, Declared								$ 0.025		$ 0.025		$ 0.025		$ 0.025		$ 0.025		$ 0.025		$ 0.025	$ 0.025	$ 0.025
Dividends	$ 2,700,000				348,000	$ 3,200,000		$ 3,200,000		$ 2,800,000		$ 2,800,000	$ 288,000	$ 2,800,000
Dividends Payable					$ 54,000								$ 53,000		$ 53,000
Dividend Equivalent [Member]
Dividends							$ 334,000		$ 286,000		$ 282,000				$ 481,000		$ 214,000		$ 214,000
Dividends Payable									$ 53,000		$ 53,000															$ 54,000
Subsequent Event [Member]
Dividends				$ 5,100,000
Dividends Payable				$ 86,000
Subsequent Event [Member] | Quarterly Dividend [Member]
Common Stock, Dividends, Per Share, Declared				$ 0.04
Subsequent Event [Member] | Dividend Equivalent [Member]
Dividends				$ 536,000
Subsequent Event [Member] | Maximum [Member]
Stock Repurchase Program, Authorized Amount				$ 75,000,000