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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Contract with Customer, Liability, Current	$ 258,000		$ 258,000			$ 4,635,000
Retail Related Inventory, Total						$ 1,555,000
Revenue from Contract with Customer, Including Assessed Tax	6,971,000	$ 10,311,000	14,260,000	$ 21,989,000
Equipment Sales [Member]
Revenue from Contract with Customer, Including Assessed Tax	6,803,000		13,900,000
Software and Licenses [Member]
Revenue from Contract with Customer, Including Assessed Tax	168,000		360,000
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Contract with Customer, Liability, Current					$ (4,338,000)
Retail Related Inventory, Total					(1,555,000)
Revenue from Contract with Customer, Including Assessed Tax	$ 271		$ (581,000)
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					$ 2,783,000

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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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