Note 3 - Inventories and Other Deferred Costs - Summary of Inventories and Other Deferred Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Raw materials	$ 4,688	$ 5,044
Work-in-process	10,589	6,004
Finished products	23,521	28,117
Other deferred costs	5,528	5,950
Total inventory and other deferred costs	$ 44,326	$ 45,115