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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($) | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Capitalized Contract Cost, Net, Total |  | $ 1,383,000 | $ 1,400,000 |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  | 56,373,000 |  | $ 42,676,000 | [1]
Deferred Tax Liabilities, Net, Noncurrent | [1] | 19,265,000 |  | $ 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 |  | (1,383,000) |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  | (1,047,000) | (1,100,000) |  |
Deferred Tax Liabilities, Net, Noncurrent |  | $ (336,000) | $ (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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