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Note 11 - Other Borrowings and Unused Lines of Credit (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 12, 2019
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Interest rate (as a percent)   2.43%   2.48%
Revolving line of credit        
Line of credit facility, maximum borrowing capacity     $ 25.0  
Interest rate (as a percent)   5.50%    
Outstanding amount line of credit   $ 0.0    
Percentage of the outstanding capital stock of the entity's bank subsidiaries used as collateral (as a percentage)   100.00%    
London Interbank Offered Rate (LIBOR)        
Variable interest rate (as a percent) 2.82%      
Prime Rate | Revolving line of credit        
Variable interest rate (as a percent)   2.25%