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Note 6 - Accrued Expenses (Details Textual) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Accrued Liabilities, Current, Total $ 2,001,091 $ 1,800,344
Chief Executive Officer [Member]    
Accrued Bonuses 1,100,000 1,000,000
Employees [Member]    
Accrued Bonuses $ 351,000 $ 339,000