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Note 2 - Significant Accounting Policies - Contract with Customer assets and liabilities (Details)
 3 Months Ended
Sep. 30, 2023
USD ($)
Balance $ 295,011
Balance 1,903,001
Revenue recognized during the period but not billed 0
Amounts billed but not recognized as revenue 537,630
Amounts reclassified to accounts receivable (10,000)
Revenue recognized related to the opening balance of deferred revenue (360,207)
Other (16,210)
Balance 2,080,424
Balance $ 268,801 [1]
[1] Contract asset balances for September 30, 2023 include a current and a long-term contract asset of $160,749 and $108,052, respectively.