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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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