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Note 2 - Significant Accounting Policies (Details Textual) $ in Thousands		12 Months Ended
		Dec. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Number of Operating Segments		2
Capitalized Contract Cost, Net, Total		$ 1,390	$ 1,400
Retained Earnings (Accumulated Deficit), Ending Balance		60,810		$ 42,676	[1]
Deferred Tax Liabilities, Net, Noncurrent	[1]	20,925		$ 19,834
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Capitalized Contract Cost, Net, Total		(1,390)
Retained Earnings (Accumulated Deficit), Ending Balance		(1,052)	(1,100)
Deferred Tax Liabilities, Net, Noncurrent		$ (338)	$ (300)
[1] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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