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Note I - Investment in Debt Security (Details Textual) - Debt Security, Corporate, Non-US [Member]
Sep. 30, 2020
USD ($)
Sep. 30, 2020
HKD ($)
Jun. 30, 2020
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Current $ 512,821 $ 4,000,000  
Investment in Held-to-maturity Debt Securities, Interest Rate     500.00%