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Note 5 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Accounts receivable - current $ 329,126 $ 139,785
Accounts receivable - non current 1,720,000 1,720,000
Total accounts receivable 2,049,126 1,859,785
Allowance for doubtful accounts - current (13,785) (13,785)
Allowance for doubtful accounts - non current (1,720,000) (1,720,000)
Total allowance for doubtful accounts (1,733,785) (1,733,785)
Accounts receivable, net of allowance for doubtful accounts $ 315,341 $ 126,000