Note 15 - Accumulated Other Comprehensive Loss (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	$ (17,807)	$ 11,229	$ (1,971)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax, Total		200	1,000
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Impact of Adoption of Accounting Standard Update	(1,300)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	$ (2,443)	$ 2,265	$ 2,613