Revenue Concentrations, Significant Customers And Geographic Areas (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Revenue, Major Customer [Line Items]
Revenue, export sales percentage	82.00%	72.00%
Customer Concentration Risk \| Sales Revenue, net \| Significant Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration risk percentage	22.00%
Customer Concentration Risk \| Accounts Receivable \| Significant Customer A [Member]
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 3.0

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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