Note 2 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Property and equipment, gross	$ 73,985,000	$ 73,951,000
Accumulated depreciation and amortization	(46,975,000)	(45,697,000)
Net property and equipment	27,010,000	28,254,000
Medical Equipment and Facilities [Member]
Property and equipment, gross	73,434,000	73,388,000
Office Equipment [Member]
Property and equipment, gross	463,000	472,000
Construction in Progress [Member]
Property and equipment, gross	$ 88,000	$ 91,000

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant