Note 3 - Investment Securities (Details) - Amortized Cost and Approximate Fair Values of Investment Securities (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Note 3 - Investment Securities (Details) - Amortized Cost and Approximate Fair Values of Investment Securities [Line Items]
Available for sale securites - amortized cost	$ 152,939	$ 169,336	$ 126,021
Available for sale securities - unrealized gains	681	2,222	1,994
Available for sale securities - unrealized losses	(3,679)	(86)	(193)
Available for sale securities - fair value	149,941	171,472	127,822
US Government Agencies Debt Securities [Member]
Note 3 - Investment Securities (Details) - Amortized Cost and Approximate Fair Values of Investment Securities [Line Items]
Available for sale securites - amortized cost	25,212	64,113	30,007
Available for sale securities - unrealized gains	201	617	589
Available for sale securities - unrealized losses	(690)	(13)	(7)
Available for sale securities - fair value	24,723	64,717	30,589
Residential Mortgage Backed Securities [Member]
Note 3 - Investment Securities (Details) - Amortized Cost and Approximate Fair Values of Investment Securities [Line Items]
Available for sale securites - amortized cost	87,308	82,098	60,550
Available for sale securities - unrealized gains	415	1,285	1,159
Available for sale securities - unrealized losses	(2,344)	(48)	(49)
Available for sale securities - fair value	85,379	83,335	61,660
US States and Political Subdivisions Debt Securities [Member]
Note 3 - Investment Securities (Details) - Amortized Cost and Approximate Fair Values of Investment Securities [Line Items]
Available for sale securites - amortized cost	17,018	4,593	19,247
Available for sale securities - unrealized gains	57	230	132
Available for sale securities - unrealized losses	(228)		(106)
Available for sale securities - fair value	16,847	4,823	19,273
Corporate Debt Securities [Member]
Note 3 - Investment Securities (Details) - Amortized Cost and Approximate Fair Values of Investment Securities [Line Items]
Available for sale securites - amortized cost	3,250	3,037	3,015
Available for sale securities - unrealized gains	8	2	2
Available for sale securities - unrealized losses	(22)	(12)	(21)
Available for sale securities - fair value	3,236	3,027	2,996
Asset-backed Securities [Member]
Note 3 - Investment Securities (Details) - Amortized Cost and Approximate Fair Values of Investment Securities [Line Items]
Available for sale securites - amortized cost	20,151	15,495	13,202
Available for sale securities - unrealized gains		88	112
Available for sale securities - unrealized losses	(395)	(13)	(10)
Available for sale securities - fair value	$ 19,756	$ 15,570	$ 13,304