Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Income Statement [Abstract]
Revenue, net	$ 16,402,356	$ 16,515,596	$ 32,983,277	$ 33,552,704
Cost of sales	13,643,879	13,795,750	27,628,426	27,988,380
Selling, general and administrative expenses	2,882,226	2,287,898	5,402,775	4,855,887
Cost and expenses, total	16,526,105	16,083,648	33,031,201	32,844,267
Income (loss) from operations	(123,749)	431,948	(47,924)	708,437
Other income (loss):
Interest and dividend income	4,948	2,451	9,575	5,153
Unrealized gain (loss) on marketable securities, net	704	7,816	(4,712)	6,984
Income (loss) before income taxes	(118,097)	442,215	(43,061)	720,574
Provision (benefit) for income taxes	(31,000)	188,000	(12,000)	306,000
Consolidated net income (loss)	(87,097)	254,215	(31,061)	414,574
Less: Net income attributable to noncontrolling interest	9,644	27,127	27,885	46,397
Net income (loss) attributable to TSR, Inc.	$ (96,741)	$ 227,088	$ (58,946)	$ 368,177
Net income (loss) per TSR, Inc. common share	$ (0.05)	$ 0.12	$ (0.03)	$ 0.19
Weighted average number of common shares outstanding	1,962,062	1,962,062	1,962,062	1,962,062