Note 5 - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	$ (5,193)	$ (5,693)
Tax effect	1,765	1,936
Accumulated other comprehensive loss, net of tax	(3,428)	(3,757)
Accumulated Net Investment Loss Attributable to Parent [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	(5,079)	(5,446)
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	$ (114)	$ (247)