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Note 3 - Accounting Policies (Details Textual)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Asset Impairment Charges   $ 0 $ 0 $ 0 $ 0  
Available-for-sale Securities, Gross Realized Gains   0 0 0 0  
Inventory, Net   5,169   5,169   $ 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   2,500   2,500    
Cost of Goods Sold   1,051 3,250  
Deferred Revenue, Current   5,560   5,560   $ 1,099
Available-for-sale Securities, Gross Realized Losses   0 $ 0 0 $ 0  
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   $ 1,100   $ 3,300    
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | SUSTOL [Member]            
Number of Major Customers       2