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Note 11 - Related Party Transactions (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Payment to Acquire Life Insurance Policy, Investing Activities $ (0) $ 5,197,000
Directors and former CFO [Member]    
Payment to Acquire Life Insurance Policy, Investing Activities 1,500,000 1,400,000
Director Jones [Member]    
Payment to Acquire Life Insurance Policy, Investing Activities $ 6,157 $ 5,734