Note 8 - Comprehensive Income (Loss) (Details) - Comprehensive Income (Loss) (Parentheticals) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended			0 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2013	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, tax	$ 1,308	$ 3,355	$ 3,160	$ 898	$ 776	$ 1,575	$ 1,733	$ (328)	$ 8,721	$ 3,756	$ 1,416
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Before Reclassification [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, tax									533			1,298
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Amounts Reclassified from AOCI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, tax									(385)			(120)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, tax									$ 3,918			$ 2,592	$ 3,770