Note 3 - Inventory and Other Deferred Costs - Summary of Inventories and Other Deferred Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Raw materials	$ 5,044	$ 5,359
Work-in-process	6,004	6,238
Finished products	28,117	23,032
Other deferred costs	5,950	4,898
Total inventory and other deferred costs	$ 45,115	$ 39,527