Note 3 - Inventories and Other Deferred Costs - Summary of Inventories and Other Deferred Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Raw materials	$ 4,859	$ 5,359
Work-in-process	5,987	6,238
Finished products	24,526	23,032
Other deferred costs	5,208	4,898
Total inventory and other deferred costs	$ 40,580	$ 39,527