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Note 2 - Significant Accounting Policies - Schedule of Changes in Contract Assets and Liabilities (Details) - USD ($)
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Balance $ 289,732 [1] $ 295,011
Revenue recognized during the period but not billed   0
Amounts reclassified to accounts receivable   (10,000)
Other   4,721
Balance [1]   289,732
Balance 1,903,001  
Amounts billed but not recognized as revenue 2,441,234  
Revenue recognized related to the opening balance of deferred revenue (1,903,001)  
Balance $ 2,441,234 $ 1,903,001
[1] Contract asset balances for June 30, 2024 include a current and a long-term contract asset of $181,680 and $108,052, respectively.