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Note 8 - Note Receivable - Summary of Note Receivable (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Sep. 30, 2020
Note receivable $ 295,000   $ 295,000  
Repayment of note (7,000) $ 0 0  
Allowance for doubtful account (100,000)   (100,000)  
Note receivable, net of allowance 188,000   195,000  
Current portion, net of allowance 119,644   82,000 $ 295,000
Note receivable, net of allowance $ 68,356   $ 113,000