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10. Segment and Geographic Information (Tables)
3 Months Ended
Jun. 30, 2019
Segment Reporting [Abstract]  
Segment and Geographic Information
   Three Months Ended June 30, 
   2019   2018 
United States  $2,487,000   $1,971,000 
Latin America   654,000    1,079,000 
Europe and Rest of the World   1,244,000    1,045,000 
Total  $4,385,000   $4,095,000