Note 6 - Goodwill, Other Intangible, and Other Assets - Summary of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment in TEL	$ 34,365	$ 31,906
Other long-term receivables	24,378	2,140
Other assets, net	2,154	3,873
Total other assets, net	$ 60,897	$ 37,919