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Note 10 - Borrowed Funds (Details) - Comparative Data for Securities Sold Under Agreements to Repurchase - Securities Sold under Agreements to Repurchase [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Note 10 - Borrowed Funds (Details) - Comparative Data for Securities Sold Under Agreements to Repurchase [Line Items] |  |  |  |
Average amount outstanding during the year (1) | [1] | $ 400,822 | $ 629,315 | $ 972,329
Maximum amount outstanding at month-end (2) | [2] | 400,000 | 700,000 | 1,200,000
Balance, December 31 |  | $ 400,000 | $ 450,000 | $ 800,000
Rate, December 31 |  | 3.89% | 3.85% | 3.87%
Weighted average interest rate for the year |  | 3.95% | 3.92% | 3.88%
[1] | Average balances were computed using daily averages.
[2] | Highest month-end balances were January 2015, January 2014, and January 2013.

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