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Note 6 - Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Accrued payroll $ 1,508,903 $ 1,323,483
Accrued directors’ fees 463,170 409,219
Other accrued expenses 104,286 118,338
Total accrued expenses $ 2,076,359 $ 1,851,040