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Note 6 - Intangible Assets (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Amortization of Intangible Assets $ 119,000 $ 119,000 $ 357,000 $ 379,000