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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