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Note 3 - Accounting Policies - Summary of Product Sales Allowances (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Balance $ 342
Provision 6,055
Payments/credits (2,065)
Balance 4,332
Allowance for Sales Returns [Member]  
Balance 49
Provision 248
Payments/credits (1)
Balance 296
Allowance for Distributor Fees [Member]  
Balance 72
Provision 744
Payments/credits (507)
Balance 309
Allowance for Rebates and Chargebacks [Member]  
Balance 221
Provision 5,063
Payments/credits (1,557)
Balance $ 3,727