Quarterly report pursuant to Section 13 or 15(d)

10. Segment and Geographic Information (Details)

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10. Segment and Geographic Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenues $ 4,968,000 $ 4,939,000 $ 9,679,000 $ 9,308,000
Product [Member]        
Revenues 4,712,000 4,635,000 9,097,000 8,730,000
Product [Member] | UNITED STATES        
Revenues 2,207,000 2,426,000 4,694,000 4,397,000
Product [Member] | Latin America [Member]        
Revenues 935,000 997,000 1,589,000 2,076,000
Product [Member] | Europe and Rest of the World [Member]        
Revenues $ 1,570,000 $ 1,212,000 $ 2,814,000 $ 2,257,000