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Note 2 - Investment Securities (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Sep. 30, 2018
Mar. 31, 2022
Mar. 31, 2021
Oct. 31, 2021
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   5.90%    
Held-to-maturity, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   5.20%    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total   $ 0    
Debt Securities, Available-for-sale, Realized Gain     $ 12,000  
Debt Securities, Available-for-sale, Realized Loss     5,000  
Proceeds from Sale of Debt Securities, Available-for-Sale   0 1,798,000  
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   63,000 234,000  
Equity Securities, FV-NI, Current   1,900,000    
Limited Partnership Interest, Technology Fund [Member]        
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount   $ 0 $ 0  
Limited Partnership Interest, Technology Fund [Member] | Other Assets [Member]        
Equity Securities without Readily Determinable Fair Value, Amount       $ 1,000,000.0
Limited Partnership Interest, Technology Fund [Member] | Other Liabilities [Member]        
Investment Company, Financial Commitment to Investee, Future Amount       $ 880,000