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Note 6 - Fair Value Measurements - Change in Fair Value Measurement Impacts Net Income (Details) - Valuation, Market Approach [Member]
Jun. 30, 2021
Dec. 31, 2020
Pull-through Rate [Member] | Minimum [Member] | Interest Rate Contract [Member]    
Derivative asset (liability) 0.7190  
Pull-through Rate [Member] | Minimum [Member] | Forward Contract [Member]    
Derivative asset (liability) 0.7190  
Pull-through Rate [Member] | Maximum [Member] | Interest Rate Contract [Member]    
Derivative asset (liability) 0.8500  
Pull-through Rate [Member] | Maximum [Member] | Forward Contract [Member]    
Derivative asset (liability) 0.8500  
Pull-through Rate [Member] | Weighted Average [Member] | Interest Rate Contract [Member]    
Derivative asset (liability) 0.7860  
Pull-through Rate [Member] | Weighted Average [Member] | Forward Contract [Member]    
Derivative asset (liability) 0.7860  
Current Reference Price [Member] | Minimum [Member] | Interest Rate Contract [Member]    
Derivative asset (liability) 0.0101 1.0191
Current Reference Price [Member] | Minimum [Member] | Forward Contract [Member]    
Derivative asset (liability) 0.0101 1.0191
Current Reference Price [Member] | Maximum [Member] | Interest Rate Contract [Member]    
Derivative asset (liability) 0.0103 1.0302
Current Reference Price [Member] | Maximum [Member] | Forward Contract [Member]    
Derivative asset (liability) 0.0103 1.0319