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Note 4 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
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Accounts receivable - current | $ 134,078 | $ 139,785
Accounts receivable - non current | 1,720,000 | 1,720,000
Accounts Receivable, before Allowance for Credit Loss | 1,854,078 | 1,859,785
Allowance for doubtful accounts - current | (13,785) | (13,785)
Allowance for doubtful accounts - non current | (1,720,000) | (1,720,000)
Accounts Receivable, Allowance for Credit Loss, Ending Balance | (1,733,785) | (1,733,785)
Accounts receivable, net of allowances for doubtful accounts | $ 120,293 | $ 126,000

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