Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	12 Months Ended
	May 31, 2021	May 31, 2020
Income Statement [Abstract]
Revenue, net	$ 68,821,217	$ 59,121,401
Cost of sales	57,500,303	49,943,405
Selling, general and administrative expenses	11,808,950	10,928,648
Cost and expenses, total	69,309,253	60,872,053
Loss from operations	(488,036)	(1,750,652)
Other income (expense):
Interest and dividend income	14,991	4,877
Interest expense	(208,392)	(79,386)
Unrealized gain (loss) from marketable securities, net	(4,648)	15,112
Other income (expense), Total	(198,049)	(59,397)
Loss before income taxes	(686,085)	(1,810,049)
Benefit from income taxes	(109,000)	(712,000)
Consolidated net loss	(577,085)	(1,098,049)
Less: Net income attributable to noncontrolling interest	23,889	28,379
Net loss attributable to TSR, Inc.	$ (600,974)	$ (1,126,428)
Basic net loss per TSR, Inc. common share (in Dollars per share)	$ (0.31)	$ (0.57)
Basic weighted average number of common shares outstanding (in Shares)	1,962,062	1,962,062
Diluted net loss per TSR, Inc. common share (in Dollars per share)	$ (0.31)	$ (0.57)
Diluted weighted average number of common shares outstanding (in Shares)	1,962,062	1,962,062