Note 17 - Income Taxes - Summary of Components of Income Tax Expense for Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal	$ (117)	$ (466)	$ (844)
State	99	49	(102)
Foreign	395	12	104
Total current income tax expense (benefit)	377	(405)	(842)
Federal	(2,954)	(766)	(2,883)
State	(807)	71	(373)
Foreign	132
Total deferred income tax benefit	(3,629)	(695)	(3,256)
Income tax benefit	$ (3,252)	$ (1,100)	$ (4,098)