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Note 1 - Summary of Significant Accounting Policies - Estimated Future Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
[1]
Dec. 31, 2021
Total $ 303 $ 422 $ 501
Finite-lived Intangible Assets, Excluding Projects in Process [Member]      
Remainder of 2023 40    
2024 87    
2025 14    
2026 14    
Thereafter 38    
Total $ 193    
[1] The balance sheet at December 31, 2022 has been derived from the audited financial statements at that date