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Note 2 - Revenue Recognition (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lapse Period for Consignment 60 days    
Accounts Receivable, after Allowance for Credit Loss, Current, Total $ 52,704 $ 55,214  
Accounts Receivable, Allowance for Credit Loss, Writeoff 0 0  
Contract with Customer, Liability, Current $ 3,412 2,520  
Revenue, Performance Obligation, Performance Period Following Prepayment 14 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 $ 2,500    
Certain Customers in China [Member] | Accrued Liabilities, Current [Member]      
Contract with Customer, Liability, Current $ 3,400 $ 2,500  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Distributor Sales [Member]      
Concentration Risk, Percentage 83.00% 87.00% 88.00%
Product [Member]      
Percentage of Revenue 99.00% 98.00% 98.00%