Note 4 - Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Intangible assets, gross	$ 14,670	$ 14,670
Less: accumulated amortization	(11,536)	(10,195)
Total	3,134	4,475	[1]
Developed Technology Rights [Member]
Intangible assets, gross	$ 9,910	9,910
Developed Technology Rights [Member] | Minimum [Member]
Intangible assets amortized useful lives (Year)	5 years
Developed Technology Rights [Member] | Maximum [Member]
Intangible assets amortized useful lives (Year)	6 years
Customer Relationships [Member]
Intangible assets amortized useful lives (Year)	4 years
Intangible assets, gross	$ 3,370	3,370
Non-compete Agreements and Tradename [Member]
Intangible assets, gross	$ 1,390	$ 1,390
Non-compete Agreements and Tradename [Member] | Minimum [Member]
Intangible assets amortized useful lives (Year)	2 years
Non-compete Agreements and Tradename [Member] | Maximum [Member]
Intangible assets amortized useful lives (Year)	3 years

[1] Derived from the Company's audited consolidated financial statements as of December 31, 2017.