Note 10 - Investments in Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Available-for-sale Securities [Table Text Block]

	September 30, 2020				December 31, 2019
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Investments available for sale:
Marketable equity securities	$	30,176	$	111,873	$	30,176	$	152,453
Restricted investments available for sale:
Corporate debt securities		63,446		67,478		63,414		65,653
Asset-based securities		46,851		47,682		54,451		55,185
U.S. Treasury securities		13,208		13,937		13,379		13,410
State and municipal securities		12,546		12,943		12,922		13,158
	$	166,227	$	253,913	$	174,342	$	299,859

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

	September 30, 2020						December 31, 2019
	Shares		Cost		Fair Value		Shares		Cost		Fair Value
NHI Common Stock		1,630,642	$	24,734	$	98,279		1,630,642	$	24,734	$	132,865

Investments Classified by Contractual Maturity Date [Table Text Block]

	September 30, 2020				December 31, 2019
	Cost		Fair Value		Cost		Fair Value
Maturities:
Within 1 year	$	22,860	$	22,795	$	15,726	$	15,767
1 to 5 years		82,046		85,640		88,314		90,408
6 to 10 years		31,145		33,605		40,126		41,231
	$	136,051	$	142,040	$	144,166	$	147,406