Note 3 - Inventory and Other Deferred Costs - Summary of Inventories and Other Deferred Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Raw materials	$ 4,085	$ 3,200
Work-in-process	5,095	3,745
Finished products	16,391	12,278
Other deferred costs	1,817	1,823
Total inventory and other deferred costs	$ 27,388	$ 21,046