Note 3 - Equity - Share Repurchase Program (Details) - USD ($)	3 Months Ended						47 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2023
Total number of shares purchased (in shares)	74,150	88,741	20,859				1,897,819
Average price paid per share (in dollars per share)	$ 5.79	$ 5.05	$ 4.97				$ 5.88
Total number of shares purchased as part of publicly announced plans or programs	$ 429,271	$ 448,266	$ 103,657	$ 3,741,477	$ 1,429,698	$ 41,276
Amount available for future share repurchases under the plans or programs	$ 9,835,910	$ 10,265,181	$ 10,713,447				$ 9,835,910