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Note 11 - Other Borrowings and Unused Lines of Credit (Details)
$ in Millions
12 Months Ended
Feb. 12, 2019
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2018
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
Interest rate (as a percent)   2.48%       4.18%
Revolving line of credit            
Line of credit facility, maximum borrowing capacity       $ 25.0 $ 20.0  
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) 282.00%          
Term notes            
Number of term notes | loan   2        
Other borrowings     $ 23.3      
Interest rate (as a percent)     5.52%      
Percentage of the outstanding capital stock of the entity's bank subsidiaries used as collateral (as a percentage)     100.00%