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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net Revenue $ 2,073,455 $ 7,053,418
United States    
Net Revenue 1,804,000 3,569,000
International    
Net Revenue 269,000 3,484,000
SteraMist Product    
Net Revenue 1,661,000 6,638,000
Service & Training    
Net Revenue $ 412,000 $ 415,000