Note 3 - Inventories and Other Deferred Costs - Summary of Inventories and Other Deferred Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Raw materials	$ 5,168	$ 5,044
Work-in-process	7,586	6,004
Finished products	26,483	28,117
Other deferred costs	5,834	5,950
Total inventory and other deferred costs	$ 45,071	$ 45,115