Note 3 - Net Patient Revenues (Details Textual) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 4,929,000		$ 4,451,000
Medicare and Medicaid [Member]
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 15,607,000	$ 15,108,000