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Note 4 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Accounts receivable - current $ 505,436 $ 2,889,731
Accounts receivable - non current 1,720,000 1,760,000
Total accounts receivable 2,225,436 4,649,731
Allowance for doubtful accounts - current (13,785) (13,785)
Allowance for doubtful accounts - non current (1,000,000) (1,000,000)
Total allowance for doubtful accounts (1,013,785) (1,013,785)
Accounts receivable, net of allowance for doubtful accounts $ 1,211,651 $ 3,635,946