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Note 4 - Loans and Allowance for Loan Losses - Impaired Loans, Net of Government Guarantees and Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Unpaid Contractual Principal Balance |  | $ 54,521,000 | $ 21,162,000 |
Recorded Investment With No Allowance |  | 24,678,000 | 13,486,000 |
Recorded Investment With Allowance |  | 19,018,000 | 4,704,000 |
Impaired Financing Receivable, Recorded Investment |  | 43,696,000 | 18,190,000 |
Impaired Financing Receivable, Related Allowance |  | 680,000 | 2,831,000 |
Impaired Financing Receivable, Average Recorded Investment | $ 16,675,000 | 35,978,000 | 16,700,000 | $ 17,500,000
Impaired Financing Receivable, Interest Income, Accrual Method | 1,200,000 | 1,593,000 | 1,200,000 | $ 800,000
Consumer Portfolio Segment [Member] |  |  |  |
Unpaid Contractual Principal Balance |  | 2,209,000 | 938,000 |
Recorded Investment With No Allowance |  | 2,170,000 | 902,000 |
Recorded Investment With Allowance |  | 3,000 | 19,000 |
Impaired Financing Receivable, Recorded Investment |  | 2,173,000 | 921,000 |
Impaired Financing Receivable, Related Allowance |  | 1,000 | 92,000 |
Impaired Financing Receivable, Average Recorded Investment | 973,000 | 1,412,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 70,000 | 67,000 |  |
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] |  |  |  |
Unpaid Contractual Principal Balance |  | 373,000 | 479,000 |
Recorded Investment With No Allowance |  | 373,000 | 479,000 |
Recorded Investment With Allowance |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 373,000 | 479,000 |
Impaired Financing Receivable, Related Allowance |  |  | 7,000 |
Impaired Financing Receivable, Average Recorded Investment | 411,000 | 346,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 30,000 | 20,000 |  |
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |  |
Unpaid Contractual Principal Balance |  | 1,836,000 | 459,000 |
Recorded Investment With No Allowance |  | 1,797,000 | 423,000 |
Recorded Investment With Allowance |  | 3,000 | 19,000 |
Impaired Financing Receivable, Recorded Investment |  | 1,800,000 | 442,000 |
Impaired Financing Receivable, Related Allowance |  | 1,000 | 85,000 |
Impaired Financing Receivable, Average Recorded Investment | 562,000 | 1,066,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 40,000 | 47,000 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Unpaid Contractual Principal Balance |  | 38,238,000 | 17,304,000 |
Recorded Investment With No Allowance |  | 18,559,000 | 10,666,000 |
Recorded Investment With Allowance |  | 11,442,000 | 4,351,000 |
Impaired Financing Receivable, Recorded Investment |  | 30,001,000 | 15,017,000 |
Impaired Financing Receivable, Related Allowance |  | 417,000 | 2,307,000 |
Impaired Financing Receivable, Average Recorded Investment | 13,712,000 | 28,854,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 987,000 | 1,274,000 |  |
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |
Unpaid Contractual Principal Balance |  | 4,275,000 | 5,678,000 |
Recorded Investment With No Allowance |  | 1,038,000 | 1,636,000 |
Recorded Investment With Allowance |  | 2,374,000 | 3,318,000 |
Impaired Financing Receivable, Recorded Investment |  | 3,412,000 | 4,954,000 |
Impaired Financing Receivable, Related Allowance |  | 156,000 | 441,000 |
Impaired Financing Receivable, Average Recorded Investment | 5,417,000 | 4,436,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 390,000 | 196,000 |  |
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |  |  |
Unpaid Contractual Principal Balance |  | 12,970,000 | 5,938,000 |
Recorded Investment With No Allowance |  | 10,630,000 | 4,702,000 |
Recorded Investment With Allowance |  | 1,753,000 | 945,000 |
Impaired Financing Receivable, Recorded Investment |  | 12,383,000 | 5,647,000 |
Impaired Financing Receivable, Related Allowance |  | 162,000 | 1,034,000 |
Impaired Financing Receivable, Average Recorded Investment | 5,148,000 | 9,486,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 370,000 | 419,000 |  |
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] |  |  |  |
Unpaid Contractual Principal Balance |  | 20,993,000 | 5,688,000 |
Recorded Investment With No Allowance |  | 6,891,000 | 4,328,000 |
Recorded Investment With Allowance |  | 7,315,000 | 88,000 |
Impaired Financing Receivable, Recorded Investment |  | 14,206,000 | 4,416,000 |
Impaired Financing Receivable, Related Allowance |  | 99,000 | 832,000 |
Impaired Financing Receivable, Average Recorded Investment | 3,147,000 | 14,932,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 227,000 | 659,000 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Unpaid Contractual Principal Balance |  | 14,074,000 | 2,920,000 |
Recorded Investment With No Allowance |  | 3,949,000 | 1,918,000 |
Recorded Investment With Allowance |  | 7,573,000 | 334,000 |
Impaired Financing Receivable, Recorded Investment |  | 11,522,000 | 2,252,000 |
Impaired Financing Receivable, Related Allowance |  | 262,000 | 432,000 |
Impaired Financing Receivable, Average Recorded Investment | 1,990,000 | 5,712,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 143,000 | 252,000 |  |
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |  |  |
Unpaid Contractual Principal Balance |  | 11,848,000 | 2,656,000 |
Recorded Investment With No Allowance |  | 2,734,000 | 1,654,000 |
Recorded Investment With Allowance |  | 7,573,000 | 334,000 |
Impaired Financing Receivable, Recorded Investment |  | 10,307,000 | 1,988,000 |
Impaired Financing Receivable, Related Allowance |  | 262,000 | 387,000 |
Impaired Financing Receivable, Average Recorded Investment | 1,736,000 | 4,666,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 125,000 | 206,000 |  |
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |  |  |
Unpaid Contractual Principal Balance |  | 2,226,000 | 264,000 |
Recorded Investment With No Allowance |  | 1,215,000 | 264,000 |
Recorded Investment With Allowance |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 1,215,000 | 264,000 |
Impaired Financing Receivable, Related Allowance |  |  | $ 45,000 |
Impaired Financing Receivable, Average Recorded Investment | 254,000 | 1,046,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | $ 18,000 | $ 46,000 |  |

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