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Note 3 - Loans and Allowance for Loan Losses - Activity in Allowance for Loan Losses and the Recorded Investments in Loans (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Provision for loan losses $ 600,000 $ 600,000  
Loans 2,441,314,000   $ 2,378,620,000
Commercial Portfolio Segment [Member]      
Loans 2,123,348,000   2,065,347,000
Retail Portfolio Segment [Member]      
Loans 317,966,000   313,273,000
Originated Loan [Member]      
Beginning balance 17,868,000 15,233,000 15,233,000
Provision for loan losses 548,000   3,098,000
Charge-offs (445,000)   (2,133,000)
Recoveries 155,000   1,670,000
Ending balance 18,126,000   17,868,000
Ending balance: individually evaluated for impairment 3,581,000   1,572,000
Ending balance: collectively evaluated for impairment 14,545,000   16,296,000
Loans 1,973,739,000   1,884,548,000
Ending balance: individually evaluated for impairment 14,207,000   13,383,000
Ending balance: collectively evaluated for impairment 1,959,532,000   1,871,165,000
Originated Loan [Member] | Commercial Portfolio Segment [Member]      
Beginning balance 16,026,000 13,672,000 13,672,000
Provision for loan losses (225,000)   2,247,000
Charge-offs (225,000)   (980,000)
Recoveries 95,000   1,087,000
Ending balance 15,671,000   16,026,000
Ending balance: individually evaluated for impairment 2,846,000   1,303,000
Ending balance: collectively evaluated for impairment 12,825,000   14,723,000
Loans 1,803,409,000   1,728,898,000
Ending balance: individually evaluated for impairment 12,060,000   12,070,000
Ending balance: collectively evaluated for impairment 1,791,349,000   1,716,828,000
Originated Loan [Member] | Retail Portfolio Segment [Member]      
Beginning balance 1,882,000 1,421,000 1,421,000
Provision for loan losses 643,000   1,031,000
Charge-offs (220,000)   (1,153,000)
Recoveries 60,000   583,000
Ending balance 2,365,000   1,882,000
Ending balance: individually evaluated for impairment 735,000   269,000
Ending balance: collectively evaluated for impairment 1,630,000   1,613,000
Loans 170,330,000   155,650,000
Ending balance: individually evaluated for impairment 2,147,000   1,313,000
Ending balance: collectively evaluated for impairment 168,183,000   154,337,000
Originated Loan [Member] | Unallocated Financing Receivables [Member]      
Beginning balance (40,000) 140,000 140,000
Provision for loan losses 130,000   (180,000)
Charge-offs 0   0
Recoveries 0   0
Ending balance 90,000   (40,000)
Ending balance: individually evaluated for impairment 0   0
Ending balance: collectively evaluated for impairment 90,000   (40,000)
Loans    
Ending balance: individually evaluated for impairment    
Ending balance: collectively evaluated for impairment    
Acquired Loan [Member]      
Beginning balance 93,000 448,000 448,000
Provision for loan losses 52,000   (198,000)
Charge-offs (11,000)   (72,000)
Recoveries 16,000    
Recoveries     (85,000)
Ending balance 150,000   93,000
Loans 467,575,000   494,072,000
Acquired Loan [Member] | Commercial Portfolio Segment [Member]      
Beginning balance 75,000 420,000 420,000
Provision for loan losses 45,000   (303,000)
Charge-offs (11,000)   0
Recoveries 16,000    
Recoveries     (42,000)
Ending balance 125,000   75,000
Loans 319,939,000   336,449,000
Acquired Loan [Member] | Retail Portfolio Segment [Member]      
Beginning balance 18,000 28,000 28,000
Provision for loan losses 7,000   105,000
Charge-offs 0   (72,000)
Recoveries 0    
Recoveries     (43,000)
Ending balance 25,000   18,000
Loans 147,636,000   157,623,000
Acquired Loan [Member] | Unallocated Financing Receivables [Member]      
Beginning balance 0 $ 0 0
Provision for loan losses 0   0
Charge-offs 0   0
Recoveries 0    
Recoveries     0
Ending balance $ 0   $ 0