Note 6 - Business Segments - Summary of Financial Information by Reporting Segment (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Net patient revenues	$ 244,095,000	$ 236,111,000
Other revenues	12,029,000	12,174,000
Net operating revenues	256,124,000	248,285,000
Cost and expenses:
Salaries, wages and benefits	147,469,000	141,388,000
Other operating	71,668,000	69,432,000
Rent	10,332,000	10,238,000
Depreciation and amortization	10,438,000	10,517,000
Interest	412,000	926,000
Total costs and expenses	240,319,000	232,501,000
Income from operations	15,805,000	15,784,000
Non-operating income (loss)	8,146,000	6,001,000
Unrealized gains/(losses) on marketable equity securities	(60,392,000)	6,838,000
Income/(loss) before income taxes	(36,441,000)	28,623,000
Inpatient Services Segment [Member]
Revenues:
Net patient revenues	230,987,000	221,635,000
Other revenues	435,000	231,000
Net operating revenues	231,422,000	221,866,000
Cost and expenses:
Salaries, wages and benefits	135,215,000	129,059,000
Other operating	65,105,000	62,629,000
Rent	8,378,000	8,291,000
Depreciation and amortization	9,571,000	9,653,000
Interest	382,000	348,000
Total costs and expenses	218,651,000	209,980,000
Income from operations	12,771,000	11,886,000
Non-operating income (loss)	0	0
Unrealized gains/(losses) on marketable equity securities	0	0
Income/(loss) before income taxes	12,771,000	11,886,000
Homecare Services Segment [Member]
Revenues:
Net patient revenues	13,108,000	14,476,000
Other revenues	0	0
Net operating revenues	13,108,000	14,476,000
Cost and expenses:
Salaries, wages and benefits	8,316,000	8,399,000
Other operating	3,819,000	4,252,000
Rent	457,000	462,000
Depreciation and amortization	54,000	61,000
Interest	0	0
Total costs and expenses	12,646,000	13,174,000
Income from operations	462,000	1,302,000
Non-operating income (loss)	0	0
Unrealized gains/(losses) on marketable equity securities	0	0
Income/(loss) before income taxes	462,000	1,302,000
Other Segments [Member]
Revenues:
Net patient revenues	0	0
Other revenues	11,594,000	11,943,000
Net operating revenues	11,594,000	11,943,000
Cost and expenses:
Salaries, wages and benefits	3,938,000	3,930,000
Other operating	2,744,000	2,551,000
Rent	1,497,000	1,485,000
Depreciation and amortization	813,000	803,000
Interest	30,000	578,000
Total costs and expenses	9,022,000	9,347,000
Income from operations	2,572,000	2,596,000
Non-operating income (loss)	8,146,000	6,001,000
Unrealized gains/(losses) on marketable equity securities	(60,392,000)	6,838,000
Income/(loss) before income taxes	$ (49,674,000)	$ 15,435,000