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Note 7 - Risk Management -Internal Rating Exposure (Details)
 12 Months Ended
Dec. 31, 2018
Probability of Default [Member] | 0 to 2 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 0 to 2
Probability of Default [Member] | 2 to 5 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 2 to 5
Probability of Default [Member] | 5 to 11 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 5 to 11
Probability of Default [Member] | 11 to 39 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 11 to 39
Probability of Default [Member] | 39 to 194 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 39 to 194
Probability of Default [Member] | 194 to 1.061 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 194 to 1,061
Probability of Default [Member] | 1.061 to 2.121 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 1,061 to 2,121
Probability of Default [Member] | 2.121 to 4.243 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale > 2,021
Subject to 12 month ECL [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 91.7
Subject to 12 month ECL [Member] | 0 to 2 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 9.6
Subject to 12 month ECL [Member] | 2 to 5 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 10.8
Subject to 12 month ECL [Member] | 5 to 11 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 6.3
Subject to 12 month ECL [Member] | 11 to 39 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 20.9
Subject to 12 month ECL [Member] | 39 to 194 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 30.1
Subject to 12 month ECL [Member] | 194 to 1.061 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 12.2
Subject to 12 month ECL [Member] | 1.061 to 2.121 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 1.6
Subject to 12 month ECL [Member] | 2.121 to 4.243 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 0.2
Subject to life time ECL [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 8.3
Subject to life time ECL [Member] | 0 to 2 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 0.0
Subject to life time ECL [Member] | 2 to 5 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 0.1
Subject to life time ECL [Member] | 5 to 11 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 0.0
Subject to life time ECL [Member] | 11 to 39 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 0.4
Subject to life time ECL [Member] | 39 to 194 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 1.8
Subject to life time ECL [Member] | 194 to 1.061 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 3.6
Subject to life time ECL [Member] | 1.061 to 2.121 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 1.2
Subject to life time ECL [Member] | 2.121 to 4.243 [Member]  
Disclosure of probability of default Line Items  
Abridged Scale 1.2