Note 3 - Basic and Diluted Net Income Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net income available to common shareholders	$ 1,136,540	$ 1,116,745
Net income available to common shareholders (in shares)	39,383,459	38,047,411
Net income available to common shareholders (in dollars per share)	$ 0.03	$ 0.03
Net income available to preferred shareholders	$ 28,489	$ 28,976
Net income available to preferred shareholders (in shares)	987,200	987,200
Net income available to preferred shareholders (in dollars per share)	$ 0.03	$ 0.03
Basic income per share	$ 1,165,029	$ 1,145,721
Basic income per share (in shares)	40,370,659	39,034,611
Basic income per share (in dollars per share)	$ 0.03	$ 0.03
Net income available to common shareholders, basic	$ 1,135,602
Impact of dilutive securities	$ 962
Impact of dilutive securities (in shares)	33,340
Net income available to common shareholders, diluted	$ 1,136,564
Net income available to common shareholders, diluted (in shares)	39,416,799
Net income available to preferred shareholders	$ 28,465
Diluted income per share	$ 1,165,029	$ 1,145,721
Diluted income per share (in shares)	40,403,999	39,034,611
Diluted income per share (in dollars per share)	$ 0.03	$ 0.03