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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Contract with Customer, Liability, Current	$ 250		$ 250			$ 4,635
Retail Related Inventory, Total						$ 1,555
Revenue from Contract with Customer, Including Assessed Tax	6,683	$ 10,560	20,943	$ 32,549
Equipment Sales [Member]
Revenue from Contract with Customer, Including Assessed Tax	6,524		20,396
Software and Licenses [Member]
Revenue from Contract with Customer, Including Assessed Tax	159		547
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	$ 784		$ 1,365
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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