Note 2 - Fair Value of Financial Instruments (Detail) - Fair Value Measurements (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Financial Assets:
Cash and cash equivalents	$ 61,847	$ 51,630	$ 59,289	$ 59,751
Cash and cash equivalents	61,847	51,630
Securities available for sale	103,489	85,670
Securities available for sale	103,489	85,670
Securities held to maturity	23,678	22,848
Securities held to maturity	24,311	22,847
Federal Home Loan Bank stock	6,281	6,281
Loans, net	554,350	590,964
Loans, net	577,280	599,782
Accrued interest receivable	2,396	2,872
Accrued interest receivable	2,396	2,872
Financial liabilities:
Deposits	676,699	687,886
Deposits	678,646	690,607
Other borrowed funds	20,098	20,296
Other borrowed funds	20,558	20,565
Subordinated debentures	13,500	13,500
Subordinated debentures	10,225	11,085
Accrued interest payable	1,358	1,894
Accrued interest payable	1,358	1,894
Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Cash and cash equivalents	61,847
Financial liabilities:
Deposits	138,164
Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Securities available for sale	103,489
Securities held to maturity	11,597
Accrued interest receivable	532
Financial liabilities:
Deposits	540,482
Other borrowed funds	20,558
Subordinated debentures	10,225
Accrued interest payable	1,358
Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Securities held to maturity	12,714
Loans, net	577,280
Accrued interest receivable	$ 1,864