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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($)	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	[1]
Capitalized Contract Cost, Net, Total	$ 1,354,000	$ 1,400,000
Retained Earnings (Accumulated Deficit), Ending Balance	51,027,000		$ 42,676,000
Deferred Tax Liabilities, Net, Noncurrent	19,577,000		$ 19,834,000
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Capitalized Contract Cost, Net, Total	(1,354,000)
Retained Earnings (Accumulated Deficit), Ending Balance	(1,025,000)	(1,100,000)
Deferred Tax Liabilities, Net, Noncurrent	$ (329,000)	$ (300,000)
[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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