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Note 23 - Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Unaudited) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Interest income | $ 29,715,000,000 | $ 29,706,000,000 | $ 30,147,000,000 | $ 28,889,000,000 | $ 28,575,000,000 | $ 28,501,000,000 | $ 27,663,000,000 | $ 27,589,000,000 | $ 118,457,000 | $ 112,328,000 | $ 89,118,000
Net interest income | 26,435,000,000 | 26,450,000,000 | 27,100,000,000 | 25,882,000,000 | 25,659,000,000 | 25,625,000,000 | 25,041,000,000 | 24,849,000,000 | 105,867,000 | 101,174,000 | 77,778,000
Net income attributable to common shares | $ 8,085,000,000 | $ 7,845,000,000 | $ 7,434,000,000 | $ 8,549,000,000 | $ 6,480,000,000 | $ 7,336,000,000 | $ 6,558,000,000 | $ 6,646,000,000 | $ 31,913,000 | $ 27,020,000 | $ 17,331,000
Earnings per share basic (in dollars per share) | $ 0.49 | $ 0.48 | $ 0.46 | $ 0.52 | $ 0.40 | $ 0.45 | $ 0.39 | $ 0.39 | $ 1.96 | $ 1.63 | $ 1.28
Earnings per share diluted (in dollars per share) | $ 0.49 | $ 0.48 | $ 0.46 | $ 0.52 | $ 0.40 | $ 0.45 | $ 0.39 | $ 0.39 | $ 1.96 | $ 1.62 | $ 1.28

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