Note 16 - Segment Information - Reconciliation of Segment Operating Results (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income from operations		$ 4,563	$ 9,564	$ 9,646
Unallocated corporate, general and administrative expenses*	[1]	(1,766)	(1,388)	(2,156)
Other income			2,549
Equity-based compensation expenses		(5,861)	(5,088)	(5,092)
Intangible assets amortization expenses		(1,700)	(1,457)	(1,284)
Write–off of expired option related to investment in other company				(400)
Losses on available-for-sale marketable securities		1,669	1,227	1,175
Total consolidated income (loss) before taxes		$ (3,095)	$ 5,407	$ 1,889

[1] Includes mainly legal, accounting, board of directors and investors relation expenses.