Note 2 - Adoption of New Accounting Standards (Details) - Changes in Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (4,264)	$ 6,869
Other comprehensive income (loss) before reclassifications	1,694	(9,490)
Amounts reclassified from accumulated other comprehensive income	42	93
Net current-period other comprehensive income (loss)	1,736	(9,397)
Ending balance	(2,528)	(2,528)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,810)	9,411
Other comprehensive income (loss) before reclassifications	1,694	(9,490)
Amounts reclassified from accumulated other comprehensive income	(1)	(38)
Net current-period other comprehensive income (loss)	1,693	(9,528)
Ending balance	(117)	(117)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,454)	(2,542)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	43	131
Net current-period other comprehensive income (loss)	43	131
Ending balance	$ (2,411)	$ (2,411)