Nature Of Business And Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) ShareBasedCompensationPlan Customer	Dec. 31, 2017 USD ($)
Schedule of Significant Accounting Policies [Line Items]
Reclassification of net unrealized losses from accumulated other comprehensive income (AOCI) to retained earnings	$ 0
Other-than-temporary impairments recognized	0	$ 0
Nonfinancial or financial items measured on a nonrecurring basis	0
Advertising expense	48	76
Research and development expense	813	812
Valuation allowance on deferred tax assets	$ 81	$ 28
Number of company compensation plans \| ShareBasedCompensationPlan	2
Accounting Standards Update No. 2016-01 [Member]
Schedule of Significant Accounting Policies [Line Items]
Reclassification of net unrealized losses from accumulated other comprehensive income (AOCI) to retained earnings	$ 7
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Schedule of Significant Accounting Policies [Line Items]
Number of customers \| Customer	1
Concentration risk percentage	12.00%

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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