Note 14 - Accumulated Other Comprehensive Loss (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	$ 5,159	$ (17,807)	$ 11,229
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax, Total			200
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Impact of Adoption of Accounting Standard Update	(1,300)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	$ 0	$ (2,443)	$ 2,265