Condensed Consolidated Statements of Income (Unaudited) - USD ($)	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Income Statement [Abstract]
Revenue, net	$ 16,580,921	$ 17,037,108
Cost of sales	13,984,547	14,192,630
Selling, general and administrative expenses	2,520,549	2,567,989
Cost and expenses, total	16,505,096	16,760,619
Income from operations	75,825	276,489
Other income (loss):
Interest and dividend income	4,627	2,702
Unrealized loss on marketable securities, net	(5,416)	(832)
Income before income taxes	75,036	278,359
Provision for income taxes	19,000	118,000
Consolidated net income	56,036	160,359
Less: Net income attributable to noncontrolling interest	18,241	19,270
Net income attributable to TSR, Inc.	$ 37,795	$ 141,089
Net income per TSR, Inc. common share	$ 0.02	$ 0.07
Weighted average number common shares outstanding	1,962,062	1,962,062