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Note 5 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
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Accounts receivable - current | $ 506,165 | $ 139,785
Accounts receivable - non current | 1,720,000 | 1,720,000
Total accounts receivable | 2,226,165 | 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 | $ 492,380 | $ 126,000

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