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Note 3 - Accounting Policies (Details Textual) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax		$ 17,277	$ 8,510	$ 28,844	$ 12,142
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance		12,640		12,640		$ 9,319
Cost of Goods and Services Sold, Total		$ 5,231	$ 1,013	$ 8,364	$ 2,199
Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,900
Cost of Goods and Services Sold, Total	200
Accounting Standards Update 2014-09 [Member] | Product Sales Allowance [Member]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance	1,100
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 1,600

X

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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