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Equity Method Investments (Schedule of Supplemental Operations Information) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Revenue | $ 28,593,000 | $ 30,036,000
Net income / (loss) | 3,607,000 | 11,962,000
StockCross [Member] |  |
Revenue | 14,823,000 | 13,340,000
Operating income / (loss) | (508,000) | (929,000)
Net income / (loss) | $ (420,000) | $ (691,000)

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