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Revenue Recognition - Sales Revenue by Product Line (Details) - USD ($)	3 Months Ended		6 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020
Disaggregation of Revenue [Line Items]
Sales revenue	$ 4,070,467	$ 3,480,641	$ 7,714,935	$ 6,909,185
Fluxing Systems
Disaggregation of Revenue [Line Items]
Sales revenue	$ 117,000	$ 94,000	$ 476,000	$ 438,000
Sales revenue, percent	3.00%	3.00%	6.00%	6.00%
Integrated Coating Systems
Disaggregation of Revenue [Line Items]
Sales revenue	$ 565,000	$ 673,000	$ 720,000	$ 1,849,000
Sales revenue, percent	14.00%	19.00%	9.00%	27.00%
Multi-Axis Coating Systems
Disaggregation of Revenue [Line Items]
Sales revenue	$ 1,891,000	$ 1,985,000	$ 3,970,000	$ 2,898,000
Sales revenue, percent	46.00%	57.00%	52.00%	42.00%
OEM Systems
Disaggregation of Revenue [Line Items]
Sales revenue	$ 845,000	$ 232,000	$ 1,171,000	$ 654,000
Sales revenue, percent	21.00%	7.00%	15.00%	9.00%
Other Product Line
Disaggregation of Revenue [Line Items]
Sales revenue	$ 652,000	$ 497,000	$ 1,378,000	$ 1,070,000
Sales revenue, percent	16.00%	14.00%	18.00%	16.00%
Total Product Line
Disaggregation of Revenue [Line Items]
Sales revenue	$ 4,070,000	$ 3,481,000	$ 7,715,000	$ 6,909,000

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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