Note 7 - Fair Value of Assets and Liabilities (Detail) - The carrying values and estimated fair values of financial instruments (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financial assets:
Cash and short-term investments	$ 70,726	$ 25,620
Securities available for sale	150,521	152,817
Loans, net	653,499	651,133
Loans held for sale, net	46,508	74,964
Accrued interest receivable	5,566	5,673
Financial liabilities:
Demand deposits	412,088	399,575
Time deposits	288,364	290,483
Borrowings	162,068	158,027
Derivative payable	464	513
Derivative payable	464	513
Accrued interest payable	797	837
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Financial assets:
Cash and short-term investments	70,726	25,620
Securities available for sale	150,521	152,817
Loans, net	641,195	640,283
Loans held for sale, net	45,432	72,727
Accrued interest receivable	5,566	5,673
Financial liabilities:
Demand deposits	412,088	399,575
Time deposits	284,376	286,609
Borrowings	167,219	162,746
Derivative payable	464	513
Derivative payable	464	513
Accrued interest payable	797	837
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and short-term investments	70,726	25,620
Accrued interest receivable	5,566	5,673
Financial liabilities:
Demand deposits	412,088	399,575
Accrued interest payable	797	837
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets:
Securities available for sale	150,521	152,817
Loans held for sale, net	46,508	74,964
Financial liabilities:
Time deposits	288,364	290,483
Borrowings	162,068	158,027
Derivative payable	464	513
Derivative payable	464	513
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets:
Loans, net	$ 653,499	$ 651,133