Note 3 - Basic and Diluted Net Income (Loss) Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended						9 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2023	Mar. 31, 2022
Net income available to common shareholders	$ 149,545						$ 811,905
Net income available to common shareholders (in shares)	39,383,459			37,844,376			39,383,459	37,574,336
Net income available to common shareholders (in dollars per share)	$ 0.00			$ 0.02			$ 0.02	$ 0.00
Net income available to preferred shareholders	$ 3,749			$ 22,121			$ 20,351	$ 319
Net income available to preferred shareholders (in shares)	987,200			987,200			987,200	987,200
Net income available to preferred shareholders (in dollars per share)	$ 0.00			$ 0.02			$ 0.02	$ 0.00
Basic net income per share	$ 153,294	$ 181,794	$ 497,168	$ 870,134	$ 1,023,335	$ (1,880,993)	$ 832,256	$ 12,476
Basic net income per share (in shares)	40,370,659			38,831,576			39,414,752	38,561,536
Basic net income per share (in dollars per share)	$ 0.00			$ 0.02			$ 0.02	$ 0.00
Net income available to common shareholders, basic	$ 149,295			$ 848,013			$ 811,276	$ 12,157
Impact of dilutive securities	$ 257						$ 644
Impact of dilutive securities (in shares)	67,689						31,293
Net income available to common shareholders, diluted	$ 149,552						$ 811,920
Net income available to common shareholders, diluted (in shares)	39,451,148
Net income available to preferred shareholders	$ 3,742						20,336
Diluted net income per share	$ 153,294			$ 870,134			$ 832,256	$ 12,476
Diluted net income per share (in shares)	40,438,348			38,831,576			40,401,952	38,561,536
Diluted net income per share (in dollars per share)	$ 0.00			$ 0.02			$ 0.02	$ 0.00
Basic (in shares)	40,370,659			38,831,576			40,370,659	38,561,536
Impact of dilutive securities	$ 257						$ 644
Net income available to common shareholders, diluted	149,552						811,920
Net income available to preferred shareholders	3,742						20,336
Diluted income per share	$ 153,294			$ 870,134			$ 832,256	$ 12,476