Note 3 - Accumulated Other Comprehensive Income (Details) - Changes in Accumulated Other Comprehensive Income by Component (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balances	$ (3,212)	$ 6,869
Other comprehensive income (loss) before reclassifications	3,670	(931)
Amounts reclassified from accumulated other comprehensive income	39	44
Net current-period other comprehensive income (loss)	3,709	(887)
Ending balance	497	5,982
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balances	(3,623)	9,411
Other comprehensive income (loss) before reclassifications	3,635	(931)
Amounts reclassified from accumulated other comprehensive income	51	0
Net current-period other comprehensive income (loss)	3,686	(931)
Ending balance	63	8,480
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balances	411	(2,542)
Other comprehensive income (loss) before reclassifications	35	0
Amounts reclassified from accumulated other comprehensive income	(12)	44
Net current-period other comprehensive income (loss)	23	44
Ending balance	$ 434	$ (2,498)