Note 11 - Equity Method Investment - TEL's Summarized Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Total Assets	$ 723,833	$ 881,640
Total Liabilities	409,037	531,529
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Total Assets	337,699	374,591
Total Liabilities	279,543	318,743
Total Equity	$ 58,156	$ 55,848