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Note 8 - Fair Value - Significant Unobservable Inputs Used In Fair Value Measurement Of Assets (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loans and advances [Member] | Bottom Of Range Member | Net Present Value [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Repo Funding Curve (1,00%) (6)  
Loans and advances [Member] | Weighted Average Member | Net Present Value [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Repo Funding Curve 0,00% 16  
Loans and advances [Member] | Top Of Range [Member] | Net Present Value [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Repo Funding Curve 1,00% 100  
Debt Securities [Member] | Bottom Of Range Member | Net Present Value [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Credit Spread 4,32    
Recovery Rate 0,00%    
Comparable Prices Inputs 0,10%    
Debt Securities [Member] | Bottom Of Range Member | Market Comparable Prices Member      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Credit Spread   18 37
Recovery Rate   0,00% 0,00%
Comparable Prices Inputs   0,01% 1,00%
Debt Securities [Member] | Weighted Average Member | Net Present Value [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Credit Spread 47,01    
Recovery Rate 37,06%    
Comparable Prices Inputs 99,92%    
Debt Securities [Member] | Weighted Average Member | Market Comparable Prices Member      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Credit Spread   83 152
Recovery Rate   28,38% 32,06%
Comparable Prices Inputs   98,31% 88,00%
Debt Securities [Member] | Top Of Range [Member] | Net Present Value [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Credit Spread 564,22    
Recovery Rate 40,00%    
Comparable Prices Inputs 143,87%    
Debt Securities [Member] | Top Of Range [Member] | Market Comparable Prices Member      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Credit Spread   504 385
Recovery Rate   40,00% 40,00%
Comparable Prices Inputs   135,94% 275,00%
Credit Option [Member] | Bottom Of Range Member | Gaussian Copula [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Correlation Default   19,37% 0,00%
Credit Option [Member] | Weighted Average Member | Gaussian Copula [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Correlation Default   44,33% 37,98%
Credit Option [Member] | Top Of Range [Member] | Gaussian Copula [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Correlation Default   61,08% 60,26%
Corporate Bond Option [Member] | Bottom Of Range Member | Black 76 [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Price Volatility   - -
Corporate Bond Option [Member] | Weighted Average Member | Black 76 [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Price Volatility   - -
Corporate Bond Option [Member] | Top Of Range [Member] | Black 76 [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Price Volatility   - -
Equity OTC Option [Member] | Bottom Of Range Member | Heston [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs     13,79
Forward Volatility   35,12 47,05
Equity OTC Option [Member] | Bottom Of Range Member | Local volatility [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs   2,49  
Equity OTC Option [Member] | Weighted Average Member | Heston [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs     27,24
Forward Volatility   35,12 47,05
Equity OTC Option [Member] | Weighted Average Member | Local volatility [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs   23,21  
Equity OTC Option [Member] | Top Of Range [Member] | Heston [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs     65,02
Forward Volatility   35,12 47,05
Equity OTC Option [Member] | Top Of Range [Member] | Local volatility [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs   60,90  
Equity OTC FX Option [Member] | Bottom Of Range Member | Black Scholes Local Voatility [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs   3,70 5,05
Equity OTC FX Option [Member] | Weighted Average Member | Black Scholes Local Voatility [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs   6,30 7,73
Equity OTC FX Option [Member] | Top Of Range [Member] | Black Scholes Local Voatility [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs   10,05 9,71
Interest Rate Option [Member] | Bottom Of Range Member | Libor Market Model [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Beta (significant unobservable item)   0,25 0,25
Correlation Rate Credit   (100) (100)
Credit Default Volatility   - -
Interest Rate Option [Member] | Weighted Average Member | Libor Market Model [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Beta (significant unobservable item)   2,00 9,00
Credit Default Volatility   - -
Interest Rate Option [Member] | Top Of Range [Member] | Libor Market Model [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Beta (significant unobservable item)   18,00 18,00
Correlation Rate Credit   100 100
Credit Default Volatility   - -
Credit Derivatives [Member] | Bottom Of Range Member | Gaussian Copula [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Correlation Default 30,40%    
Credit Derivatives [Member] | Weighted Average Member | Gaussian Copula [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Correlation Default 44,87%    
Credit Derivatives [Member] | Top Of Range [Member] | Gaussian Copula [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Correlation Default 60,95%    
Variable Income Derivatives [Member] | Bottom Of Range Member | Option Models On Equities Baskets Of Equity Funds [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Correlations Inputs (100%)    
Volatility Inputs 6,52    
Variable Income Derivatives [Member] | Weighted Average Member | Option Models On Equities Baskets Of Equity Funds [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Correlations Inputs 100%    
Volatility Inputs 29,90    
Variable Income Derivatives [Member] | Top Of Range [Member] | Option Models On Equities Baskets Of Equity Funds [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Correlations Inputs 100%    
Volatility Inputs 141,77    
Exchange Rate Derivatives [Member] | Bottom Of Range Member | Option Models Of FX Underlyings [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs 4,11    
Exchange Rate Derivatives [Member] | Weighted Average Member | Option Models Of FX Underlyings [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs 10,00    
Exchange Rate Derivatives [Member] | Top Of Range [Member] | Option Models Of FX Underlyings [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Volatility Inputs 16,14    
Interest Rate Derivatives [Member] | Bottom Of Range Member | Option Models On IR Underlying [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Beta (significant unobservable item) 0,25    
Correlation Rate Credit (100)    
Credit Default Volatility -    
Interest Rate Derivatives [Member] | Weighted Average Member | Option Models On IR Underlying [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Beta (significant unobservable item) 2,00    
Credit Default Volatility -    
Interest Rate Derivatives [Member] | Top Of Range [Member] | Option Models On IR Underlying [Member]      
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items      
Beta (significant unobservable item) 18,00    
Correlation Rate Credit 100    
Credit Default Volatility -