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Note 8 - Note Receivable - Summary of Note Receivable (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Note receivable – current $ 0 $ 295,000
Note receivable – non-current 295,000 0
Allowance for doubtful account (100,000) 0
Note receivable, net of allowance $ 195,000 $ 295,000