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Note 4 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Accounts receivable - current $ 754,204 $ 1,587,817
Accounts receivable - non current 1,720,000 1,720,000
Total accounts receivable 2,474,204 3,307,817
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 allowances for doubtful accounts $ 740,419 $ 1,574,032