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Sale Of Business Components (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 18, 2016 | Feb. 03, 2016 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from divestiture of business |  |  |  |  | $ 740,000 | $ 19,795,000 |
Payments to acquire distribution rights |  |  |  |  | $ 409,000 | $ 1,226,000 |
Geographic Concentration Risk [Member] | Long-Lived Assets [Member] | Domestic [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Concentration percentage |  |  |  | 57.00% | 60.00% |  |
HeRO Graft Product Line [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Amount of consideration received from sale of product line |  | $ 18,500,000 |  |  |  |  |
Proceeds from divestiture of business |  | 17,800,000 | $ 740,000 |  |  |  |
Pre-tax gain (loss) on sale business components |  | $ 8,800,000 |  |  |  |  |
ProCol [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from divestiture of business | $ 2,000,000 |  |  |  |  |  |
Pre-tax gain (loss) on sale business components | $ (845,000) |  |  |  |  |  |
HeRO Graft And ProCol Product Lines [Member] | Maximum [Member] | Product Lines Concentration Risk [Member] | Total Revenues [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  | 10.00%

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