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Note 9 - Equity Method Investment - TEL's Summarized Financial Information - Income Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue | $ 110,298 | $ 108,801 | $ 84,865
Cost of Sales | 20,404 | 37,307 | 37,343
Operating Expenses | 65,058 | 47,281 | 35,525
Operating Income | 24,836 | 24,213 | 11,997
Net Income | $ 13,403 | $ 16,496 | $ 6,954

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