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Note 1 - Summary of Significant Accounting Policies - Estimated Future Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Total $ 223 $ 263 $ 422
Finite-lived Intangible Assets, Excluding Projects in Process [Member]      
2024 47    
2025 14    
2026 14    
2027 14    
2028 14    
Thereafter 10    
Total $ 113