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Note 16 - Subsequent Events (Details Textual) - USD ($)							1 Months Ended												3 Months Ended						9 Months Ended
Note 16 - Subsequent Events (Details Textual) - USD ($)	Oct. 24, 2023	Aug. 25, 2023	May 25, 2023	Feb. 24, 2023	May 25, 2022	Feb. 25, 2022	Nov. 30, 2023	Oct. 31, 2023	Aug. 31, 2023	Jul. 31, 2023	May 31, 2023	Apr. 30, 2023	Feb. 28, 2023	Jan. 31, 2023	May 31, 2022	Apr. 30, 2022	Feb. 28, 2022	Jan. 31, 2022	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Jul. 31, 2022
Common Stock, Dividends, Per Share, Declared (in dollars per share)																			$ 0.025	$ 0.025	$ 0.025	$ 0.025	$ 0.025	$ 0.025	$ 0.075	$ 0.075
Dividends Payable									$ 54,000		$ 53,000		$ 53,000		$ 53,000		$ 53,000		$ 7,000						$ 7,000		$ 53,000
Forecast [Member]
Dividends	$ 3,200,000
Dividends Payable							$ 54,000
Quarterly Dividend [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)										$ 0.025		$ 0.025		$ 0.025		$ 0.025		$ 0.025							$ 0.025
Dividends		$ 3,200,000	$ 2,800,000	$ 2,800,000	$ 2,600,000	$ 2,400,000																			$ 2,700,000
Quarterly Dividend [Member] \| Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)								$ 0.025
Dividend Equivalent [Member]
Dividends									$ 333,000		282,000		283,000		214,000		214,000								$ 263,000,000,000
Dividends Payable											$ 5,000		$ 5,000		$ 2,000		$ 2,000
Dividend Equivalent [Member] \| Forecast [Member]
Dividends							335,000
Dividends Payable							$ 2,000