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Note 8 - Note Receivable - Summary of Note Receivable (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Sep. 30, 2020
Note receivable | $ 295,000 | $ 295,000 |  |
Repayment of note | (3,000) | 0 |  |
Allowance for doubtful account | (100,000) | (100,000) |  |
Note receivable, net of allowance | 192,000 | 195,000 |  |
Current portion, net of allowance | 82,000 | 82,000 | $ 82,000 | $ 295,000
Note receivable, net of allowance | $ 110,000 | $ 113,000 | $ 113,000 |

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