Note 15 - Revenue Recognition - Composition of Revenue From Services (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer, Excluding Assessed Tax	$ 181,905	$ 178,595	$ 265,418	$ 237,577	$ 185,340	$ 179,744	$ 309,893	$ 329,219	$ 863,495	$ 1,004,196	$ 1,774,718
Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									515,275	755,630	1,607,106
Healthcare Insurers [Member] | Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									315,560	326,144	520,244
Government Payers [Member] | Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									82,502	97,191	222,242
Client Payers [Member] | Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									100,171	316,309	843,405
Self-Pay [Member] | Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 17,042	$ 15,986	$ 21,215