Note 11 - Equity Method Investment - TEL's Summarized Financial Information - Income Statement (Details) - Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 22,984	$ 30,709	$ 72,202	$ 82,683
Cost of Sales	2,748	6,302	10,332	17,213
Operating Expenses	15,184	16,634	51,708	42,775
Operating Income	5,052	7,773	10,162	22,695
Net Income	$ 2,729	$ 4,585	$ 2,308	$ 14,452