Condensed Consolidated Income Statements (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue
Total revenue	$ 1,372,638	$ 1,158,867	$ 2,693,262	$ 2,308,330
Cost of sales	994,002	790,670	1,878,235	1,563,407
Gross profit	378,636	368,197	815,027	744,923
Selling, general and administrative expenses	685,926	573,072	1,287,062	1,186,522
Operating income (loss)	(307,290)	(204,875)	(472,035)	(441,599)
Other income and (expense)
Gain (loss) on investments	(11,423)	4,288	(6,574)	(5,919)
Interest income	16,245	21,133	32,735	40,537
Interest expense	(15,114)	(6,846)	(27,185)	(14,184)
Paycheck Protection Program Loan Forgiven			10,000
Gain on equipment disposal	2,074		1,432
Economic Injury Disaster Loan advance		10,000		10,000
Other income (expense)	2,450	4,272	1,398	16,358
Total other income and (expense)	(5,768)	32,847	11,806	46,792
Income (loss) before provision for income taxes	(313,058)	(172,028)	(460,229)	(394,807)
Provision for income taxes	50	2,422	5,750	13,600
Net income (loss)	(313,108)	(174,450)	(465,979)	(408,407)
Gain (loss) attributable to non-controlling interest	(96,488)	9,735	(102,436)	23,548
Net income (loss) attributable to Mentor	$ (216,620)	$ (184,185)	$ (363,543)	$ (431,955)
Basic and diluted net income (loss) per Mentor common share:
Basic and diluted	$ (0.009)	$ (0.008)	$ (0.016)	$ (0.019)
Weighted average number of shares of Mentor common stock outstanding:
Basic and diluted*	22,850,947	22,850,947	22,850,947	22,850,947
Service [Member]
Revenue
Total revenue	$ 1,362,308	$ 1,146,839	$ 2,672,062	$ 2,283,763
Finance Lease Revenue [Member]
Revenue
Total revenue	$ 10,330	$ 12,028	$ 21,200	$ 24,567