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Note 2 - Revenue Recognition (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Lapse Period for Consignment 60 days    
Accounts Receivable, Net, Current, Total $ 55,214 $ 38,037  
Allowance for Doubtful Accounts Receivable, Write-offs 0 0  
Contract with Customer, Liability, Current $ 2,520 4,742  
Revenue, Performance Obligation, Performance Period Following Prepayment 90 days    
Minimum [Member]      
Contract with Customer, Payment Term 30 days    
Maximum [Member]      
Contract with Customer, Payment Term 60 days    
Certain Customers in China [Member]      
Contract with Customer, Payment Term Required Prior to Shipping Products 14 days    
Contract with Customer, Liability, Revenue Recognized $ 4,700    
Certain Customers in China [Member] | Accrued Liabilities, Current [Member]      
Contract with Customer, Liability, Current $ 2,500 $ 4,700  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Distributor Sales [Member]      
Concentration Risk, Percentage 87.00% 88.00% 88.00%
Product [Member]      
Percentage of Revenue 98.00% 98.00% 99.00%