Note 16 - Segment Information - Reconciliation of Segment Operating Results (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income from operations		$ 4,877	$ 4,563	$ 9,564
Unallocated corporate, general and administrative expenses*	[1]	(2,013)	(1,766)	(1,388)
Other income				2,549
Equity-based compensation expenses		(6,804)	(5,861)	(5,088)
Intangible assets amortization expenses		(1,700)	(1,700)	(1,457)
Losses on available-for-sale marketable securities		1,815	1,669	1,227
Total consolidated income (loss) before taxes		$ (3,825)	$ (3,095)	$ 5,407

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