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Note 6 - Line of Credit (Details Textual) - Revolving Credit Facility [Member] - USD ($)
9 Months Ended
Dec. 31, 2022
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 15, 2018
Line of Credit Facility, Maximum Borrowing Capacity         $ 400,000
Line of Credit Facility, Expiration Date May 15, 2024        
Debt Instrument, Interest Rate, Stated Percentage     8.87%    
Short-Term Debt, Total   $ 112,809   $ 334,760