Segment information (Details) - USD ($)	12 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
Net Sales	$ 11,833,730	$ 10,849,475
Rental Expense	158,629	162,522
Interest Expense	58,447	64,527
Net Income (Loss)	547,729	606,133
Assets	10,669,537	10,741,629
Debt	1,319,737	1,477,921
Ultrasonic Spraying
Net Sales	11,738,982	10,757,825
Rental Expense	196,298	196,298
Interest Expense	83	1,223
Net Income (Loss)	669,974	740,309
Assets	$ 8,214,873	8,227,705
Debt		20,542
Rental Real Estate Operations
Net Sales	$ 291,046	287,948
Rental Expense	158,629	162,522
Interest Expense	58,364	63,304
Net Income (Loss)	(122,245)	(134,176)
Assets	2,454,664	2,513,924
Debt	1,319,737	1,457,379
Eliminations
Net Sales	196,298	196,298
Rental Expense	(196,298)	(196,298)
Consolidated
Net Sales	11,833,730	10,849,475
Rental Expense	158,629	162,522
Interest Expense	58,447	64,527
Net Income (Loss)	547,729	606,133
Assets	10,669,537	10,741,629
Debt	$ 1,319,737	$ 1,477,921