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Note 6 - Accrued Expenses - Accrued expenses (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Accrued professional fees $ 224,719 $ 276,239
PayOnline accrual 66,430 69,039
Accrued interest 40,892 43,021
Accrued bonus 1,429,934 1,318,060
Accrued foreign taxes 6,081 2,064
Other accrued expenses 233,035 91,921
Total accrued expenses $ 2,001,091 $ 1,800,344