Note 3 - Coronavirus Pandemic (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2020	Dec. 31, 2021
Proceeds from Medicare Accelerated and Advance Payment Program			$ 51,253,000
Contract with Customer, Liability, Current	$ 5,003,000			$ 15,022,000
Revenue from Contract with Customer, Including Assessed Tax	256,337,000	$ 216,855,000
Supplemental Medicaid Payments [Member]
Revenue from Contract with Customer, Including Assessed Tax	5,538,000	3,955,000
Other Noncurrent Liabilities [Member]
Accrued Payroll Taxes	10,545,000
Provider Relief Fund Under CARES Act [Member]
Government Assistance, Amount	$ 10,620,000	$ 22,749,000