Note 3 - Accumulated Other Comprehensive Income (Details) - Changes in Accumulated Other Comprehensive Income by Component (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 5,478	$ (4,264)	$ (3,212)	$ 6,869
Other comprehensive (loss) income before reclassifications	(1,522)	1,694	7,049	(9,490)
Amounts reclassified from accumulated other comprehensive income	15	42	134	93
Net current-period other comprehensive (loss) income	(1,507)	1,736	7,183	(9,397)
Ending balance	3,971	(2,528)	3,971	(2,528)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	5,021	(1,810)	(3,623)	9,411
Other comprehensive (loss) income before reclassifications	(1,522)	1,694	7,049	(9,490)
Amounts reclassified from accumulated other comprehensive income	(7)	(1)	66	(38)
Net current-period other comprehensive (loss) income	(1,529)	1,693	7,115	(9,528)
Ending balance	3,492	(117)	3,492	(117)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	457	(2,454)	411	(2,542)
Other comprehensive (loss) income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	22	43	68	131
Net current-period other comprehensive (loss) income	22	43	68	131
Ending balance	$ 479	$ (2,411)	$ 479	$ (2,411)