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Note 5 - Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Accrued payroll expenses $ 231,093 $ 93,404
Accrued interest expense 590,216 565,623
Accrued general and administrative expenses 111,720 348,761
Accrued commissions 67,682 39,545
Other accrued expenses 724,610 254,472
Total $ 1,725,321 $ 1,301,805