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Note 4 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Accounts receivable - current | $ 703,685 | $ 1,587,817
Accounts receivable - non current | 1,720,000 | 1,720,000
Total accounts receivable | 2,423,685 | 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 allowance for doubtful accounts | $ 689,900 | $ 1,574,032

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