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Note 3 - Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Asset Impairment Charges   $ 0 $ 0 $ 0 $ 0  
Available-for-sale Securities, Gross Realized Gains   0 0 0 0  
Available-for-sale Securities, Gross Realized Losses   0 0 0 0  
Inventory, Net   4,801   4,801   $ 5,340
Inventory, Raw Materials, Net of Reserves   1,400   1,400    
Inventory, Work in Process, Net of Reserves   1,300   1,300    
Inventory, Finished Goods, Net of Reserves   2,100   2,100    
Cost of Goods Sold   1,013 2,199  
Deferred Revenue, Current   4,788   4,788   $ 1,099
Accounting Standards Update 2016-09 [Member]            
Deferred Tax Assets, Gross   3,600   3,600    
Deferred Tax Assets, Valuation Allowance   3,600   3,600    
Cost of Sales [Member]            
Inventory Write-down $ 900          
SUSTOL [Member]            
Cost of Goods Sold   $ 1,000   $ 2,200