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Note 8 - Note Receivable - Summary of Note Receivable (Details) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Sep. 30, 2020
Note receivable | $ 295,000 |  | $ 295,000 |
Repayment of note | (9,000) | $ 0 | 0 |
Allowance for doubtful account | (140,000) |  | (100,000) |
Note receivable, net of allowance | 146,000 |  | 195,000 |
Current portion, net of allowance | 0 |  | 82,000 | $ 295,000
Note receivable, net of allowance | $ 146,000 |  | $ 113,000 |

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