Annual report pursuant to Section 13 and 15(d)

Note 4 - Receivables (Details Textual)

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Note 4 - Receivables (Details Textual) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, after Allowance for Credit Loss, Total $ 1,442,231 $ 668,712 $ 652,839