Note 2 - Adoption of New Accounting Standards (Details) - Changes in Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 5,982	$ 6,869
Other comprehensive loss before reclassifications	(10,250)	(11,188)
Amounts reclassified from accumulated other comprehensive income	4	55
Net current-period other comprehensive (loss) income	(10,246)	(11,133)
Ending balance	(4,264)	(4,264)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	8,480	9,411
Other comprehensive loss before reclassifications	(10,250)	(11,188)
Amounts reclassified from accumulated other comprehensive income	(40)	(33)
Net current-period other comprehensive (loss) income	(10,290)	(11,221)
Ending balance	(1,810)	(1,810)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,498)	(2,542)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	44	88
Net current-period other comprehensive (loss) income	44	88
Ending balance	$ (2,454)	$ (2,454)