Note 7 - Business Segments - Summary of Financial Information by Reporting Segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues:
Net patient revenues	$ 328,674,000	$ 277,005,000	$ 894,415,000	$ 804,617,000
Other revenues	11,524,000	11,480,000	34,172,000	36,013,000
Net operating revenues	340,198,000	288,485,000	938,032,000	840,630,000
Government stimulus income	0	0	9,445,000	0
Costs and expenses:
Salaries, wages, and benefits	213,395,000	182,664,000	576,609,000	525,782,000
Other operating	82,509,000	72,490,000	238,092,000	217,213,000
Rent	10,886,000	10,094,000	31,804,000	30,087,000
Depreciation and amortization	10,619,000	10,135,000	30,543,000	30,266,000
Interest	1,742,000	77,000	1,788,000	268,000
Total costs and expenses	319,151,000	275,460,000	878,836,000	803,616,000
Income/(loss) from operations	21,047,000	13,025,000	59,196,000	37,014,000
Non-operating income (loss)	4,224,000	4,097,000	14,865,000	12,116,000
Unrealized gains on marketable equity securities	32,767,000	(3,093,000)	56,290,000	2,943,000
Income before income taxes	58,038,000	14,029,000	130,351,000	52,073,000
Inpatient Services Segment [Member]
Revenues:
Net patient revenues	293,026,000	243,865,000	790,664,000	706,795,000
Other revenues	370,000	297,000	710,000	894,000
Net operating revenues	293,396,000	244,162,000	791,374,000	707,689,000
Government stimulus income			0
Costs and expenses:
Salaries, wages, and benefits	175,241,000	151,912,000	474,190,000	435,517,000
Other operating	72,384,000	64,228,000	207,883,000	192,473,000
Rent	8,422,000	8,186,000	24,795,000	24,520,000
Depreciation and amortization	9,632,000	9,203,000	27,646,000	27,474,000
Interest	1,742,000	77,000	1,788,000	268,000
Total costs and expenses	267,421,000	233,606,000	736,302,000	680,252,000
Income/(loss) from operations	25,975,000	10,556,000	55,072,000	27,437,000
Non-operating income (loss)	0	0	0	0
Unrealized gains on marketable equity securities	0	0	0	0
Income before income taxes	25,975,000	10,556,000	55,072,000	27,437,000
Homecare Services Segment [Member]
Revenues:
Net patient revenues	35,648,000	33,140,000	103,751,000	97,822,000
Other revenues	0	0	0	0
Net operating revenues	35,648,000	33,140,000	103,751,000	97,822,000
Government stimulus income			0
Costs and expenses:
Salaries, wages, and benefits	21,456,000	20,066,000	63,761,000	60,804,000
Other operating	6,612,000	5,868,000	18,977,000	17,356,000
Rent	602,000	538,000	1,736,000	1,639,000
Depreciation and amortization	172,000	185,000	545,000	555,000
Interest	0	0	0	0
Total costs and expenses	28,842,000	26,657,000	85,019,000	80,354,000
Income/(loss) from operations	6,806,000	6,483,000	18,732,000	17,468,000
Non-operating income (loss)	0	0	0	0
Unrealized gains on marketable equity securities	0	0	0	0
Income before income taxes	6,806,000	6,483,000	18,732,000	17,468,000
Other Operating Segment [Member]
Revenues:
Net patient revenues	0	0	0	0
Other revenues	11,154,000	11,183,000	33,462,000	35,119,000
Net operating revenues	11,154,000	11,183,000	42,907,000	35,119,000
Government stimulus income			9,445,000
Costs and expenses:
Salaries, wages, and benefits	16,698,000	10,686,000	38,658,000	29,461,000
Other operating	3,513,000	2,394,000	11,232,000	7,384,000
Rent	1,862,000	1,370,000	5,273,000	3,928,000
Depreciation and amortization	815,000	747,000	2,352,000	2,237,000
Interest	0	0	0	0
Total costs and expenses	22,888,000	15,197,000	57,515,000	43,010,000
Income/(loss) from operations	(11,734,000)	(4,014,000)	(14,608,000)	(7,891,000)
Non-operating income (loss)	4,224,000	4,097,000	14,865,000	12,116,000
Unrealized gains on marketable equity securities	32,767,000	(3,093,000)	56,290,000	2,943,000
Income before income taxes	$ 25,257,000	$ (3,010,000)	$ 56,547,000	$ 7,168,000