Note 4 - Net Patient Revenues (Details Textual) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Contract with Customer, Liability, Current	$ 586,000	$ 15,022,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance	7,405,000	6,411,000
Medicare and Medicaid [Member]
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 18,019,000	$ 17,595,000