Note 13 - Stockholders' Equity (Details) - Components of Accumulated Other Comprehensive Loss and Changes During the Year: (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, net of tax	$ (11,375)	$ 12,137
Other comprehensive income before reclassifications, net of tax	9,758	(23,280)
Amounts reclassified from accumulated other comprehensive income, net of tax	(1,290)	(232)
Net current period other comprehensive income, net of tax	8,468	(23,512)
Ending balance, net of tax	(2,907)	(11,375)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, net of tax	(8,522)	18,921
Other comprehensive income before reclassifications, net of tax	13,548	(26,541)
Amounts reclassified from accumulated other comprehensive income, net of tax	(1,634)	(902)
Net current period other comprehensive income, net of tax	11,914	(27,443)
Ending balance, net of tax	3,392	(8,522)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, net of tax	(2,853)	(6,784)
Other comprehensive income before reclassifications, net of tax	(3,790)	3,261
Amounts reclassified from accumulated other comprehensive income, net of tax	344	670
Net current period other comprehensive income, net of tax	(3,446)	3,931
Ending balance, net of tax	$ (6,299)	$ (2,853)