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Note 7 - Risk Management -Internal Rating and Probability of Default (Details) - External Rating [Member]
12 Months Ended
Dec. 31, 2018
Estandar & Poors [Member] | AAA  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale AAA
Estandar & Poors [Member] | AA Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale AA+
Estandar & Poors [Member] | AA  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale AA
Estandar & Poors [Member] | AA Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale AA-
Estandar & Poors [Member] | A Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale A+
Estandar & Poors [Member] | A  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale A
Estandar & Poors [Member] | A Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale A-
Estandar & Poors [Member] | BBB Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BBB+
Estandar & Poors [Member] | BBB  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BBB
Estandar & Poors [Member] | BBB Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BBB-
Estandar & Poors [Member] | BB Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BB+
Estandar & Poors [Member] | BB  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BB
Estandar & Poors [Member] | BB Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BB-
Estandar & Poors [Member] | B Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale B+
Estandar & Poors [Member] | B  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale B
Estandar & Poors [Member] | B Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale B-
Estandar & Poors [Member] | CCC Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CCC+
Estandar & Poors [Member] | CCC  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CCC
Estandar & Poors [Member] | CCC Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CCC-
Estandar & Poors [Member] | CC Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CC+
Estandar & Poors [Member] | CC  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CC
Estandar & Poors [Member] | Below Rating Scale  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CC-
Reduced Scale [Member] | AAA  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale AAA
Reduced Scale [Member] | AA Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale AA+
Reduced Scale [Member] | AA  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale AA
Reduced Scale [Member] | AA Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale AA-
Reduced Scale [Member] | A Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale A+
Reduced Scale [Member] | A  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale A
Reduced Scale [Member] | A Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale A-
Reduced Scale [Member] | BBB Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BBB+
Reduced Scale [Member] | BBB  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BBB
Reduced Scale [Member] | BBB Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BBB-
Reduced Scale [Member] | BB Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BB+
Reduced Scale [Member] | BB  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BB
Reduced Scale [Member] | BB Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale BB-
Reduced Scale [Member] | B Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale B+
Reduced Scale [Member] | B  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale B
Reduced Scale [Member] | B Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale B-
Reduced Scale [Member] | CCC Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CCC+
Reduced Scale [Member] | CCC  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CCC
Reduced Scale [Member] | CCC Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CCC-
Reduced Scale [Member] | CC Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CC+
Reduced Scale [Member] | CC  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CC
Reduced Scale [Member] | Below Rating Scale  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale CC-
Average [Member] | AAA  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 1
Average [Member] | AA Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 2
Average [Member] | AA  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 3
Average [Member] | AA Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 4
Average [Member] | A Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 5
Average [Member] | A  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 8
Average [Member] | A Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 10
Average [Member] | BBB Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 14
Average [Member] | BBB  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 20
Average [Member] | BBB Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 31
Average [Member] | BB Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 51
Average [Member] | BB  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 88
Average [Member] | BB Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 150
Average [Member] | B Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 255
Average [Member] | B  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 441
Average [Member] | B Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 785
Average [Member] | CCC Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 1,191
Average [Member] | CCC  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 1,500
Average [Member] | CCC Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 1,890
Average [Member] | CC Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 2,381
Average [Member] | CC  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 3,000
Average [Member] | Below Rating Scale  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 3,780
Minimum [Member] | AAA  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale -
Minimum [Member] | AA Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 2
Minimum [Member] | AA  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 3
Minimum [Member] | AA Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 4
Minimum [Member] | A Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 5
Minimum [Member] | A  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 6
Minimum [Member] | A Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 9
Minimum [Member] | BBB Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 11
Minimum [Member] | BBB  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 17
Minimum [Member] | BBB Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 24
Minimum [Member] | BB Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 39
Minimum [Member] | BB  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 67
Minimum [Member] | BB Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 116
Minimum [Member] | B Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 194
Minimum [Member] | B  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 335
Minimum [Member] | B Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 581
Minimum [Member] | CCC Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 1,061
Minimum [Member] | CCC  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 1,336
Minimum [Member] | CCC Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 1,684
Minimum [Member] | CC Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 2,121
Minimum [Member] | CC  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 2,673
Minimum [Member] | Below Rating Scale  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 3,367
Maximun [Member] | AAA  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 2
Maximun [Member] | AA Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 3
Maximun [Member] | AA  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 4
Maximun [Member] | AA Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 5
Maximun [Member] | A Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 6
Maximun [Member] | A  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 9
Maximun [Member] | A Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 11
Maximun [Member] | BBB Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 17
Maximun [Member] | BBB  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 24
Maximun [Member] | BBB Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 39
Maximun [Member] | BB Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 67
Maximun [Member] | BB  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 116
Maximun [Member] | BB Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 194
Maximun [Member] | B Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 335
Maximun [Member] | B  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 581
Maximun [Member] | B Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 1,061
Maximun [Member] | CCC Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 1,336
Maximun [Member] | CCC  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 1,684
Maximun [Member] | CCC Minus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 2,121
Maximun [Member] | CC Plus  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 2,673
Maximun [Member] | CC  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 3,367
Maximun [Member] | Below Rating Scale  
Disclosure Of External Credit Exposures Line Items  
Abridged Scale 4,243