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Note 3 - Available for Sale Debt Securities (Details Textual)
$ in Thousands
3 Months Ended
May 01, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Available-for-sale Securities, Gross Realized Gain (Loss), Total   $ 0 $ 0  
Proceeds from Sale of Debt Securities, Available-for-sale $ 12,000      
Debt Securities, Available-for-sale, Realized Gain (Loss), Total $ 0      
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions   7   54
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Total   $ 0    
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount   0    
Collateral Pledged [Member]        
Debt Securities, Available-for-sale, Restricted   384,000   $ 403,000
Other Assets [Member]        
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total   $ 1,500   $ 1,600