Note 3 - Inventories and Other Deferred Costs - Summary of Inventories and Other Deferred Costs (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Raw materials	$ 4,399	$ 4,085
Work-in-process	5,477	5,095
Finished products	18,824	16,391
Other deferred costs	3,544	1,817
Total inventory and other deferred costs	$ 32,243	$ 27,388