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Note 3 - Accounting Policies - Summary of Product Sales Allowance (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Balance $ 342
Provision 11,668
Payments/credits (5,822)
Balance 6,188
Allowance for Sales Returns [Member]  
Balance 49
Provision 291
Payments/credits (1)
Balance 339
Allowance for Distributor Fees [Member]  
Balance 72
Provision 1,328
Payments/credits (816)
Balance 584
Allowance for Rebates and Chargebacks [Member]  
Balance 221
Provision 10,049
Payments/credits (5,005)
Balance $ 5,265