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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective income tax rate | 5.00% | 56.00% | 4.00%
FDII deduction | $ (737,000) | $ (525,000) |
Interest deductibility threshold | 30.00% |  |
Interest deduction limit | $ 10,500,000 | 6,600,000 |
Excess interest not deducted | $ 2,400,000 | $ 17,700,000 |
Federal statutory income tax rate | 21.00% | 21.00% | 34.00%
Valuation allowances against deferred tax assets | $ 3,218,000 | $ 3,372,000 |
Net deferred tax liability | 20,363,000 | 23,156,000 |
Federal net operating loss carryforwards related to the acquisitions of Cardiogenesis and Hemosphere | 2,700,000 |  |
State net operating loss carryforwards | 2,800,000 |  |
Foreign net operating loss carryforwards | $ 1,600,000 |  |
Operating loss carryforwards expiration date | Dec. 31, 2022 |  |
Research and development tax credit carryforwards | $ 631,000 |  |
Total uncertain tax liability including interest and penalties | 4,000,000.0 | 4,300,000 |
Uncertain tax liability recorded as reduction to deferred tax assets | 300,000 | 286,000 |
Uncertain tax liability recorded to non-current liability | 3,700,000 | $ 4,000,000.0 |
Approximate amount of uncertain tax liability to be recognized in 2020 | $ 1,000,000.0 |  |
Research [Member] |  |  |
Tax credit carryforwards expiration date | Dec. 31, 2026 |  |
Texas Tax Credit [Member] |  |  |
State net operating loss carryforwards | $ 128,000 |  |
Tax credit carryforwards expiration date | Dec. 31, 2027 |  |
Foreign Authority [Member] |  |  |
Net deferred tax liability | $ 35,000 |  |
Operating loss carryforwards expiration date | Dec. 31, 2024 |  |

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