Note 3 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Property and equipment, gross		$ 74,237,000
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization	$ 81,227,000
Accumulated depreciation	(55,383,000)	(50,770,000)
Net property and equipment	25,844,000	23,467,000
Medical Equipment and Facilities [Member]
Property and equipment, gross	77,150,000	73,709,000
Office Equipment [Member]
Property and equipment, gross	306,000	422,000
Construction in Progress [Member]
Property and equipment, gross	$ 3,771,000	$ 106,000