Note 8 - Fair Value Measurement (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Available for sale securities:
Available-for-sale securities	$ 149,941	$ 127,822	$ 171,472
Loans held for sale	2,885	1,548	4,280
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Available-for-sale securities	24,723	30,589	64,717
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
US Government Agencies Debt Securities [Member] \| Estimate of Fair Value Measurement [Member]
Available for sale securities:
Available-for-sale securities	24,723	30,589	64,717
US Government Agencies Debt Securities [Member]
Available for sale securities:
Available-for-sale securities	24,723	30,589	64,717
Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Fair Value, Inputs, Level 1 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Available-for-sale securities	85,379	61,660	83,335
Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Fair Value, Inputs, Level 3 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Estimate of Fair Value Measurement [Member]
Available for sale securities:
Available-for-sale securities	85,379	61,660	83,335
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Available-for-sale securities	16,847	19,273	4,823
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
US States and Political Subdivisions Debt Securities [Member] \| Estimate of Fair Value Measurement [Member]
Available for sale securities:
Available-for-sale securities	16,847	19,273	4,823
US States and Political Subdivisions Debt Securities [Member]
Available for sale securities:
Available-for-sale securities	16,847	19,273	4,823
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Available-for-sale securities	3,236	2,996	3,027
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
Corporate Debt Securities [Member] \| Estimate of Fair Value Measurement [Member]
Available for sale securities:
Available-for-sale securities	3,236	2,996	3,027
Corporate Debt Securities [Member]
Available for sale securities:
Available-for-sale securities	3,236	2,996	3,027
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Available-for-sale securities	19,756	13,304	15,570
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
Asset-backed Securities [Member] \| Estimate of Fair Value Measurement [Member]
Available for sale securities:
Available-for-sale securities	19,756	13,304	15,570
Asset-backed Securities [Member]
Available for sale securities:
Available-for-sale securities	19,756	13,304	15,570
Fair Value, Inputs, Level 1 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
Loans held for sale	0	0	0
Warrant liability			0
Total assets measured at fair value on a recurring basis	0	0	0
Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Available-for-sale securities	149,941	127,822	171,472
Loans held for sale	0	0	0
Warrant liability			0
Total assets measured at fair value on a recurring basis	149,941	127,822	171,472
Fair Value, Inputs, Level 3 [Member]
Available for sale securities:
Available-for-sale securities	0	0	0
Loans held for sale	2,885	1,548	4,280
Warrant liability			(150)
Total assets measured at fair value on a recurring basis	2,885	1,548	4,130
Estimate of Fair Value Measurement [Member]
Available for sale securities:
Available-for-sale securities	149,941	127,822	171,472
Loans held for sale	2,885	1,548	4,280
Warrant liability			(150)
Total assets measured at fair value on a recurring basis	$ 152,826	$ 129,370	$ 175,602

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

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