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GEOGRAPHIC INFORMATION (Details) - Geographic information regarding net sales - USD ($) | 12 Months Ended
--- | ---
May 31, 2021 | May 31, 2020
Revenues from sales to unaffiliated customers: |  |
Net Sales | $ 7,199,027 | $ 6,692,711
Net Sales Percent | 100.00% |
Europe [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales | $ 4,301,000 | 2,434,000
Asia [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales | 1,908,000 | 1,867,000
UNITED STATES |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales | 548,000 | 445,000
South America [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales | 250,000 | 1,615,000
Middle East [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales | 192,000 | 314,000
Other [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales |  | $ 18,000
Geographic Concentration Risk [Member] | Revenue, Segment Benchmark [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales Percent | 100.00% | 100.00%
Geographic Concentration Risk [Member] | Europe [Member] | Revenue, Segment Benchmark [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales Percent | 60.00% | 36.00%
Geographic Concentration Risk [Member] | Asia [Member] | Revenue, Segment Benchmark [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales Percent | 26.00% | 28.00%
Geographic Concentration Risk [Member] | UNITED STATES | Revenue, Segment Benchmark [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales Percent | 8.00% | 7.00%
Geographic Concentration Risk [Member] | South America [Member] | Revenue, Segment Benchmark [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales Percent | 3.00% | 24.00%
Geographic Concentration Risk [Member] | Middle East [Member] | Revenue, Segment Benchmark [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales Percent | 3.00% | 5.00%
Geographic Concentration Risk [Member] | Other [Member] | Revenue, Segment Benchmark [Member] |  |
Revenues from sales to unaffiliated customers: |  |
Net Sales Percent | 0.00% | 0.00%

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