Note 6 - Treasury Stock and Net Income (Loss) Per Common Share (Details Textual) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Receipt of Donated Treasury Stock, Shares	3,720
Value of Donated Treasury Shares	$ 1
Common Stock, Shares, Outstanding		1,377,026		1,377,026
Weighted Average Number of Shares Outstanding, Basic		1,377,026	1,380,746	1,377,026	1,380,746