Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Owned, Federal Income Tax Note [Line Items]
Effective income tax rate	28.00%		(3.00%)
Net deferred tax liability	$ 23,185,000	$ 26,442,000
Valuation allowances against deferred tax assets	17,942,000	13,282,000
Federal net operating loss carryforwards related to the acquisitions of Cardiogenesis and Hemosphere	1,600,000
State net operating loss carryforwards	2,500,000
Foreign net operating loss carryforwards	5,600,000
Research and development tax credit carryforwards	483,000
Other tax credit	93,000
Excess interest carryforward	5,559,000	3,547,000
Interest deduction limit	8,100,000	11,700,000
Income tax benefit	(4,208,000)	(7,000)	$ 492,000
Non-current liabilities recorded related to interest and penalties on uncertain tax positions	358,000	220,000
Penalties and interest income (expense)	145,000	(35,000)	180,000
Total uncertain tax liability including interest and penalties	4,900,000	4,300,000
Uncertain tax liability recorded as reduction to deferred tax assets	100,000	300,000
Uncertain tax liability recorded to non-current liability	4,800,000	4,000,000
Approximate amount that would affect tax rate	3,600,000	$ 3,200,000	$ 2,600,000
Approximate amount of uncertain tax liability to be recognized	112,000
Correction In Calculation Of Valuation Allowance And Uncertain Tax Position
Investments, Owned, Federal Income Tax Note [Line Items]
Income tax benefit	2,100,000
Foreign Authority
Investments, Owned, Federal Income Tax Note [Line Items]
Net deferred tax liability	$ 0