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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Contract with Customer, Liability, Current	$ 282			$ 4,635
Retail Related Inventory, Total				$ 1,555
Revenue from Contract with Customer, Including Assessed Tax	7,289	$ 11,678
Equipment Sales [Member]
Revenue from Contract with Customer, Including Assessed Tax	7,109
Software and Licenses [Member]
Revenue from Contract with Customer, Including Assessed Tax	180
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	$ (852)
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

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Carrying amount as of the balance sheet date of merchandise inventory held by a retailer, wholesaler, or distributor for future sale; includes packaging and other supplies used to store, transport, or present merchandise inventory.

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