Note 13 - Contingencies and Commitments (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Dividends, Common Stock, Cash		$ 320,000	$ 322,000	$ 335,000	$ 335,000
Monthly Dividend [Member] | Forecast [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.0075
Dividends, Common Stock, Cash	$ 322,000