Note 12 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Fair Value, by Balance Sheet Grouping [Table Text Block]

	March 31, 2021				December 31, 2020
	Carrying Value		Fair Value		Carrying Value		Fair Value
Notes payable, net (1)	$	5,045,868	$	5,306,905	$	5,044,208	$	5,486,953
Mortgages payable, net (2)	$	295,613	$	297,860	$	311,272	$	312,933

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

	Balance at March 31, 2021		Level 1		Level 2		Level 3
Marketable equity securities	$	767,989	$	767,989	$	-	$	-

	Balance at December 31, 2020		Level 1		Level 2		Level 3
Marketable equity securities	$	706,954	$	706,954	$	-	$	-

	Balance at December 31, 2020		Level 1		Level 2		Level 3
Real estate	$	24,899	$	-	$	-	$	24,899
Other real estate investments	$	5,464	$	-	$	-	$	5,464