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
-Topic 280
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Significant Payors (Narrative) (Details)	3 Months Ended		12 Months Ended
Significant Payors (Narrative) (Details)	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenues [Member] \| Illinois Department On Aging [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	20.40%	23.20%
Revenues [Member] \| Geographic Concentration Risk [Member] \| Illinois [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	35.80%	37.70%
Accounts Receivable [Member] \| Illinois Department On Aging [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	23.80%		15.90%