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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

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