Consolidated Statements of Operations - USD ($)	12 Months Ended
	May 31, 2020	May 31, 2019
Income Statement [Abstract]
Revenue, net	$ 59,121,401	$ 63,340,028
Cost of sales	49,943,405	53,514,636
Selling, general and administrative expenses	10,928,648	11,672,946
Cost and expenses, total	60,872,053	65,187,582
Loss from operations	(1,750,652)	(1,847,554)
Other income (expense):
Interest and dividend income	4,877	22,309
Interest expense	(79,386)
Loss on sale of fixed asset		(2,882)
Unrealized gain (loss) from marketable securities, net	15,112	(8,928)
Operating Income, Total	(59,397)	10,499
Loss before income taxes	(1,810,049)	(1,837,055)
Benefit for income taxes	(712,000)	(538,000)
Consolidated net loss	(1,098,049)	(1,299,055)
Less: Net income attributable to noncontrolling interest	28,379	36,940
Net loss attributable to TSR, Inc.	$ (1,126,428)	$ (1,335,995)
Basic and diluted net loss per TSR, Inc. common share	$ (0.57)	$ (0.68)
Basic and diluted weighted average number of common shares outstanding	1,962,062	1,962,062