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Note 3 - Investment Securities (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2018
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Debt Securities, Available-for-Sale and Held-to-Maturity, Allowance for Credit Loss   $ 0   $ 0    
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   9.00%   9.00%    
Held-to-maturity, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   32.20%   32.20%    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total       $ 0    
Debt Securities, Available-for-Sale, Realized Gain       78,000    
Debt Securities, Available-for-Sale, Realized Loss       92,000    
Proceeds from Sale of Debt Securities, Available-for-Sale     $ 0 10,816,000 $ 0  
Investment, Number of Shares Acquired (in shares) 90,000          
Investment Ownership Percentage 5.00%          
Payments to Acquire Other Investments $ 1,900,000          
Equity Securities, FV-NI, Unrealized Gain (Loss)   $ (92,000) (99,000) 45,000 (36,000)  
Equity Securities, FV-NI, Current   1,500,000   1,500,000   $ 1,500,000
Limited Partnership Interest, Technology Fund [Member]            
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount   0 $ 0 0 $ 0  
Limited Partnership Interest, Technology Fund [Member] | Other Assets [Member]            
Equity Securities without Readily Determinable Fair Value, Amount   1,000,000.0   1,000,000.0   1,000,000.0
Limited Partnership Interest, Technology Fund [Member] | Other Liabilities [Member]            
Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount   $ 630,000   $ 630,000   $ 780,000