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Note 2 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Property and equipment, gross |  | $ 81,227,000
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization, Total | $ 79,135,000 |
Accumulated depreciation | (52,256,000) | (55,383,000)
Net property and equipment | 26,879,000 | 25,844,000
Property and equipment, net | 26,879,000 | 25,844,000
Non-US [Member] |  |
Net property and equipment | 5,984,000 | 3,966,000
Property and equipment, net | 5,984,000 | 3,966,000
Medical Equipment and Facilities [Member] |  |
Property and equipment, gross | 75,272,000 | 77,150,000
Office Equipment [Member] |  |
Property and equipment, gross | 314,000 | 306,000
Construction in Progress [Member] |  |
Property and equipment, gross | $ 3,549,000 | $ 3,771,000

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