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Note 2 - Significant Accounting Policies - Schedule of Earnings Per Share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Net income applicable to common shareholders $ 1,951,350 $ 1,880,063 $ 5,351,551 $ 4,892,800
Weighted average common shares outstanding, basic (in shares) 18,205,000 18,254,000 18,254,000 18,249,000
Warrants to purchase Common Stock (in shares) 633,000 889,000 775,000 873,000
Weighted average common shares outstanding, diluted (in shares) 18,838,000 19,143,000 19,029,000 19,122,000
Basic (in dollars per share) $ 0.11 $ 0.1 $ 0.29 $ 0.27
Diluted (in dollars per share) $ 0.1 $ 0.1 $ 0.28 $ 0.26