Note 7 - Other Comprehensive Income (Details) - Change in Each Component of Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Securities Available for Sale	$ 0	$ 278	$ 13	$ 459
Accumulated Other Comprehensive Income	0	278	13	459
Securities Available for Sale	(456)	633	(6,828)	1,151
Accumulated Other Comprehensive Income	(456)	633	(6,828)	1,151
Quarter To Date [Member] | Beginning of Period [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Securities Available for Sale	(907)
Accumulated Other Comprehensive Income	(907)		(907)
Securities Available for Sale	(456)
Accumulated Other Comprehensive Income	(456)
Securities Available for Sale	(456)
Accumulated Other Comprehensive Income	(456)
Securities Available for Sale	(907)		(907)
Accumulated Other Comprehensive Income	(907)		(907)
Quarter To Date [Member] | End of Period [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income	(1,363)		(1,363)
Securities Available for Sale	(1,363)		(1,363)
Accumulated Other Comprehensive Income	(1,363)		(1,363)
Previous Years Quarter Ended [Member] | Beginning of Period [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Securities Available for Sale		5,393
Accumulated Other Comprehensive Income		5,393		5,393
Securities Available for Sale		911
Accumulated Other Comprehensive Income		911
Securities Available for Sale		(278)
Accumulated Other Comprehensive Income		(278)
Securities Available for Sale		633
Accumulated Other Comprehensive Income		633
Securities Available for Sale		5,393		5,393
Accumulated Other Comprehensive Income		5,393		5,393
Previous Years Quarter Ended [Member] | End of Period [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income		6,026		6,026
Securities Available for Sale		6,026		6,026
Accumulated Other Comprehensive Income		6,026		6,026
Nine Months Ended [Member] | Beginning of Period [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Securities Available for Sale			5,465
Accumulated Other Comprehensive Income	5,465		5,465
Securities Available for Sale			(6,841)
Accumulated Other Comprehensive Income			(6,841)
Securities Available for Sale			(13)
Accumulated Other Comprehensive Income			(13)
Securities Available for Sale			(6,828)
Accumulated Other Comprehensive Income			(6,828)
Securities Available for Sale	5,465		5,465
Accumulated Other Comprehensive Income	5,465		5,465
Nine Months Ended [Member] | End of Period [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income	(1,363)		(1,363)
Securities Available for Sale	(1,363)		(1,363)
Accumulated Other Comprehensive Income	(1,363)		(1,363)
Previous Year Nine Months Ended [Member] | Beginning of Period [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Securities Available for Sale				4,875
Accumulated Other Comprehensive Income		4,875		4,875
Securities Available for Sale				1,610
Accumulated Other Comprehensive Income				1,610
Securities Available for Sale				(459)
Accumulated Other Comprehensive Income				(459)
Securities Available for Sale				1,151
Accumulated Other Comprehensive Income				1,151
Securities Available for Sale		4,875		4,875
Accumulated Other Comprehensive Income		4,875		4,875
Previous Year Nine Months Ended [Member] | End of Period [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income		6,026		6,026
Securities Available for Sale		6,026		6,026
Accumulated Other Comprehensive Income		$ 6,026		$ 6,026