Note 8 - Fair Value of Assets and Liabilities (Details) - The Carrying Values and Estimated Fair Values of Financial Instruments (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financial assets:
Cash and short-term investments	$ 192,906	$ 148,139
Cash and short-term investments	192,906	148,139
Securities available for sale	211,799	218,110
Loans, net	783,857	785,532
Loans, net	797,433	800,488
Loans held for sale, net	28,630	35,879
Loans held for sale, net	28,630	35,879
Accrued interest receivable	6,026	6,360
Accrued interest receivable	6,026	6,360
BOLI	14,081	13,988
Derivative asset	627	533
Derivative asset	627	533
Financial liabilities:
Time deposits	392,558	399,883
Time deposits	394,540	403,291
Borrowings	173,552	169,835
Borrowings	166,606	162,194
Derivative payable	290	331
Derivative payable	290	331
Accrued interest payable	830	843
Accrued interest payable	830	843
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and short-term investments	192,906	148,139
Accrued interest receivable	6,026	6,360
Financial liabilities:
Accrued interest payable	830	843
Fair Value, Inputs, Level 1 [Member] | Demand Deposits [Member]
Financial liabilities:
Demand deposits	634,642	608,409
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Securities available for sale	211,799	218,110
Loans held for sale, net	28,630	35,879
BOLI	14,081	13,988
Derivative asset	627	533
Derivative asset	627	533
Financial liabilities:
Time deposits	394,540	403,291
Borrowings	166,606	162,194
Derivative payable	290	331
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Loans, net	797,433	800,488
Demand Deposits [Member]
Financial liabilities:
Demand deposits	634,642	608,409
Demand deposits	$ 634,642	$ 608,409