Note 4 - Loans and Allowance for Loan Losses (Detail) - Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Loans with a specific valuation allowance
Specific Allowance	$ 666		$ 1,367
Total
Recorded Balance	17,554		17,277
Unpaid Principal Balance	19,525		18,574
Specific Allowance	666		1,367
Average Investment in Impaired Loans	17,293	24,004
Interest Income Recognized	26	32
One to Four Family Units [Member]
Loans without a specific valuation allowance
Recorded Balance	2,112		2,245
Unpaid Principal Balance	2,199		2,271
Average Investment in Impaired Loans	2,140	1,409
Interest Income Recognized	2	5
Loans with a specific valuation allowance
Recorded Balance	92		115
Unpaid Principal Balance	92		130
Specific Allowance	21		90
Average Investment in Impaired Loans	107	604
Total
Recorded Balance	2,204		2,360
Unpaid Principal Balance	2,291		2,401
Specific Allowance	21		90
Average Investment in Impaired Loans	2,247	2,013
Interest Income Recognized	2	5
Real Estate Construction [Member]
Loans without a specific valuation allowance
Recorded Balance	5,321		5,015
Unpaid Principal Balance	6,266		5,575
Average Investment in Impaired Loans	5,107	985
Loans with a specific valuation allowance
Recorded Balance	614		1,260
Unpaid Principal Balance	614		1,260
Specific Allowance	170		608
Average Investment in Impaired Loans	1,104	7,021
Total
Recorded Balance	5,935		6,275
Unpaid Principal Balance	6,880		6,835
Specific Allowance	170		608
Average Investment in Impaired Loans	6,211	8,006
Real Estate Commercial [Member]
Loans without a specific valuation allowance
Recorded Balance	5,079		2,430
Unpaid Principal Balance	5,404		2,755
Average Investment in Impaired Loans	3,190	5,650
Interest Income Recognized	23	13
Loans with a specific valuation allowance
Recorded Balance			3,243
Unpaid Principal Balance			3,243
Specific Allowance			180
Average Investment in Impaired Loans	2,245	3,513
Total
Recorded Balance	5,079		5,673
Unpaid Principal Balance	5,404		5,998
Specific Allowance			180
Average Investment in Impaired Loans	5,435	9,163
Interest Income Recognized	23	13
Commercial Loans [Member]
Loans without a specific valuation allowance
Recorded Balance	1,557		318
Unpaid Principal Balance	1,860		689
Average Investment in Impaired Loans	643	1,903
Interest Income Recognized	1	6
Loans with a specific valuation allowance
Recorded Balance	2,412		2,237
Unpaid Principal Balance	2,723		2,237
Specific Allowance	423		441
Average Investment in Impaired Loans	2,281	2,270
Total
Recorded Balance	3,969		2,555
Unpaid Principal Balance	4,583		2,926
Specific Allowance	423		441
Average Investment in Impaired Loans	2,924	4,173
Interest Income Recognized	1	6
Consumer and Other Loans [Member]
Loans without a specific valuation allowance
Recorded Balance	103		103
Unpaid Principal Balance	103		103
Average Investment in Impaired Loans	102	383
Interest Income Recognized		8
Loans with a specific valuation allowance
Recorded Balance	264		311
Unpaid Principal Balance	264		311
Specific Allowance	52		48
Average Investment in Impaired Loans	374	266
Total
Recorded Balance	367		414
Unpaid Principal Balance	367		414
Specific Allowance	52		48
Average Investment in Impaired Loans	476	649
Interest Income Recognized		$ 8