Note 7 - Fair Value of Financial Instruments (Details) - Financial Instruments - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financial Assets:
Held-to-maturity securities	$ 19,470	$ 22,870
Restricted stock	21,174	23,304
Financial Liabilities:
Checking deposits	766,427	655,753
Savings, NOW and money market deposits	1,215,675	1,000,325
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]
Financial Assets:
Cash and cash equivalents	33,364	32,944
Restricted stock	21,174	23,304
Financial Liabilities:
Checking deposits	766,427	655,753
Savings, NOW and money market deposits	1,215,675	1,000,325
Short-term borrowings	63,100	136,486
Accrued interest payable:
Checking, savings, NOW and money market deposits	34	27
Short-term borrowings	1	1
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Financial Assets:
Cash and cash equivalents	33,364	32,944
Restricted stock	21,174	23,304
Financial Liabilities:
Checking deposits	766,427	655,753
Savings, NOW and money market deposits	1,215,675	1,000,325
Short-term borrowings	63,100	136,486
Accrued interest payable:
Checking, savings, NOW and money market deposits	34	27
Short-term borrowings	1	1
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]
Financial Assets:
Held-to-maturity securities	16,771	21,119
Accrued interest receivable:
Investment securities	4,792	4,689
Financial Liabilities:
Time deposits	322,470	328,947
Long-term debt	356,862	345,000
Accrued interest payable:
Time deposits	4,859	5,077
Long-term debt	611	667
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Financial Assets:
Held-to-maturity securities	17,553	22,156
Accrued interest receivable:
Investment securities	4,792	4,689
Financial Liabilities:
Time deposits	327,853	333,992
Long-term debt	358,880	348,519
Accrued interest payable:
Time deposits	4,859	5,077
Long-term debt	611	667
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]
Financial Assets:
Held-to-maturity securities	1,917	714
Loans	2,077,369	1,781,425
Accrued interest receivable:
Loans	5,302	4,355
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Financial Assets:
Held-to-maturity securities	1,917	714
Loans	2,079,464	1,765,202
Accrued interest receivable:
Loans	$ 5,302	$ 4,355