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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

X
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