Note 2 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Property and equipment, gross	$ 76,619,000	$ 72,854,000
Accumulated depreciation	(43,178,000)	(41,729,000)
Net property and equipment	33,441,000	31,125,000
Non-US [Member]
Net property and equipment	7,115,000	6,104,000
Medical Equipment and Facilities [Member]
Property and equipment, gross	74,182,000	71,148,000
Office Equipment [Member]
Property and equipment, gross	604,000	594,000
Construction in Progress [Member]
Property and equipment, gross	$ 1,833,000	$ 1,112,000