Condensed Consolidated Statements of Income (Unaudited) - USD ($)	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Statements Of Operations [Abstract]
Revenue, net	$ 17,037,108	$ 15,242,383
Cost of sales	14,192,630	12,640,900
Selling, general and administrative expenses	2,567,989	2,315,740
Cost and expenses, total	16,760,619	14,956,640
Income from operations	276,489	285,743
Other income (loss):
Interest and dividend income	2,702	2,736
Unrealized gain (loss) on marketable securities, net	(832)	3,440
Income before income taxes	278,359	291,919
Provision for income taxes	118,000	136,000
Consolidated net income	160,359	155,919
Less: Net income attributable to noncontrolling interest	19,270	8,142
Net income attributable to TSR, Inc.	$ 141,089	$ 147,777
Net income per TSR, Inc. common share	$ 0.07	$ 0.08
Weighted average number common shares outstanding	1,962,062	1,962,062