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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Jan. 16, 2018
Inventory Valuation Reserves, Ending Balance		$ 10	$ 59
Due To Factor, Current		374	454
Revenue, Remaining Performance Obligation, Amount				$ 6,000
Revenue from Contract with Customer, Including Assessed Tax		$ 10,879	$ 13,540
Price Report, Formula and Sample [Member]
Revenue, Remaining Performance Obligation, Amount				1,750
Revenue from Contract with Customer, Including Assessed Tax	$ 1,750
Delivery and Installation of Equipment and Training [Member]
Revenue, Remaining Performance Obligation, Amount				2,000
License [Member]
Revenue, Remaining Performance Obligation, Amount				$ 2,250
Finished Goods, Product [Member] \| Minimum [Member]
Inventory, Finished Goods, Shelf Life		180 days
Finished Goods, Product [Member] \| Maximum [Member]
Inventory, Finished Goods, Shelf Life		270 days