Note 2 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	Jun. 30, 2026	Dec. 31, 2025
Property and equipment, gross	$ 69,064,000	$ 71,065,000
Accumulated depreciation	(40,469,000)	(39,943,000)
Net property and equipment	28,595,000	31,122,000
Non-US [Member]
Net property and equipment	7,687,000	8,082,000
Medical Equipment and Facilities [Member]
Property and equipment, gross	68,306,000	70,172,000
Office Equipment [Member]
Property and equipment, gross	687,000	638,000
Construction in Progress [Member]
Property and equipment, gross	$ 71,000	$ 255,000

Amount of accumulated depreciation, depletion, and amortization of property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection.