Note 5 - Sale of Business Component - Pro Forma Adjustment to Income Statement (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue	$ 17,487	$ 14,255
Operating income (loss)	429	(395)
Net income (loss)	$ (35)	$ (735)
Basic and diluted net income (loss) per share (in dollars per share)	$ 0	$ (0.05)