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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Inventory, Net, Total |  |  | $ 13,228 | $ 14,415 |
Inventory, Noncurrent, Total |  |  | $ 8,953 | 8,708 |
Number of Reporting Units |  |  | 1 |  |
Goodwill, Impairment Loss |  | $ 12,724 | $ 0 | 12,724 |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | 2,782 |
Contract with Customer, Liability, Current |  |  | 283 | 4,635 |
Retail Related Inventory, Total |  |  |  | 1,555 |
Revenue from Contract with Customer, Including Assessed Tax |  |  | 28,156 | 41,804 |
Advertising Expense |  |  | $ 1,037 | $ 1,079 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% | 35.00% |
Increase (Decrease) of Net Deferred Tax Assets |  |  |  | $ (3,300) |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  | 3,300 |
Equipment Sales [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 27,369 |  |
Software and Licenses [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 787 |  |
Retained Earnings [Member] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | 2,782 |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |
Contract with Customer, Liability, Current |  |  |  |  | $ (4,338)
Retail Related Inventory, Total |  |  |  |  | (1,555)
Revenue from Contract with Customer, Including Assessed Tax | $ 1,252 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ 2,783
Customer Relationships [Member] |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  | 769 |
Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 2 years |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 10 years |  |
Advance Replacement Units [Member] |  |  |  |  |
Inventory, Net, Total |  |  | $ 184 | $ 76 |

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