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Note 9 - Related Party Transaction (Details Textual) - Prophet [Member] - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Related Party Transaction, Amounts of Transaction $ 292,000    
Related Party Transaction, Expenses from Transactions with Related Party   $ 260,000 $ 32,000