Note 7 - Fair Value Measurements (Detail) - Level 3 Asset Quantitative Information (USD $) In Thousands, unless otherwise specified	2 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Fair Value (in Dollars)	1,324	1,338
Selling Cost [Member] | Minimum [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Range	6.00%	6.00%
Range	6.00%	6.00%
Selling Cost [Member] | Minimum [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Range	6.00%	6.00%
Range	6.00%	6.00%
Selling Cost [Member] | Maximum [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Range	10.00%	10.00%
Range	10.00%	10.00%
Selling Cost [Member] | Maximum [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Range	10.00%	10.00%
Range	10.00%	10.00%
Selling Cost [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value (in Dollars)	1,048	1,068
Valuation Techniques	Discounted appraised value	Discounted appraised value
Unobservable Input	Selling cost	Selling cost
Unobservable Input	Selling cost	Selling cost
Selling Cost [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Valuation Techniques	Discounted appraised value	Discounted appraised value
Unobservable Input	Selling cost	Selling cost
Fair Value (in Dollars)	2,055	2,177
Unobservable Input	Selling cost	Selling cost
Discount for Lack of Marketability [Member] | Minimum [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Range	0.00%	0.00%
Range	0.00%	0.00%
Discount for Lack of Marketability [Member] | Minimum [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Range	0.00%	0.00%
Range	0.00%	0.00%
Discount for Lack of Marketability [Member] | Maximum [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Range	10.00%	10.00%
Range	10.00%	10.00%
Discount for Lack of Marketability [Member] | Maximum [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Range	30.00%	30.00%
Range	30.00%	30.00%
Discount for Lack of Marketability [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Unobservable Input	Discount for lack of marketability and age of appraisal	Discount for lack of marketability and age of appraisal
Unobservable Input	Discount for lack of marketability and age of appraisal	Discount for lack of marketability and age of appraisal
Discount for Lack of Marketability [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Unobservable Input	Discount for lack of marketability and age	Discount for lack of marketability and age
Unobservable Input	Discount for lack of marketability and age	Discount for lack of marketability and age
Internal Evaluations [Member] | Minimum [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Range	10.00%	10.00%
Range	10.00%	10.00%
Internal Evaluations [Member] | Maximum [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Range	50.00%	50.00%
Range	50.00%	50.00%
Internal Evaluations [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Valuation Techniques	Internal evaluations	Internal evaluations
Unobservable Input	Internal evaluations	Internal evaluations
Fair Value (in Dollars)	2,376	2,379
Unobservable Input	Internal evaluations	Internal evaluations