Note 3 - Equity - Share Repurchase Program (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021
Total number of shares purchased (in shares)	538,376	244,552	7,600
Average price paid per share (in dollars per share)	$ 6.95	$ 5.85	$ 5.43
Amount available for future share repurchases under the plans or programs	$ 6,838,434,000,000
Share Repurchase Program [Member]
Total number of shares purchased (in shares)	1,501,322	962,946	718,394
Amount available for future share repurchases under the plans or programs	$ 6,838,434	$ 10,579,912	$ 12,009,609