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Note 22 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($) | Oct. 19, 2017 | Oct. 06, 2017
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U.S. Bank National Association [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility, Maximum Amount Outstanding During Period |  | $ 75,000,000
U.S. Bank National Association [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50%
Mergers [Member] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 14,700,000,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans | 10,500,000,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits | 11,200,000,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 76,700,000 |
OKSB Merger [Member] |  |
Business Combination, Conversion of Each Outstanding Common stock to Company’s Common Stock | 0.3903 |
Business Combination, Conversion of Each Outstanding common stock to Cash | $ 5.11 |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 7,250,000 |
Payments to Acquire Businesses, Gross | $ 95,000,000 |
First Texas Merger [Member] |  |
Business Combination, Conversion of Each Outstanding Common stock to Company’s Common Stock | 0.8263 |
Business Combination, Conversion of Each Outstanding common stock to Cash | $ 6.60 |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 6,500,000 |
Payments to Acquire Businesses, Gross | $ 70,000,000 |

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