Concentration of Sales to Major Customers) (Narrative) (Details) - USD ($)	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Total revenue	$ 479,000	$ 1,469,000
Customer Revenue Concentration
Total revenue	$ 479,000	$ 1,500,000
Concentration Risk, Percentage	100.00%	100.00%

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details