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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands
 3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Revenues $ 21,114,000 $ 18,158,000
Cost of revenues 9,100,000 7,017,000
Gross profit 12,014,000 11,141,000
Operating expenses    
Selling 2,424,000 1,799,000
General and administrative 5,980,000 4,737,000
Research and development 1,035,000 963,000
Total operating expenses 9,439,000 7,499,000
Operating income 2,575,000 3,642,000
Other expense, net 406,000 116,000
Earnings before income taxes 2,169,000 3,526,000
Income taxes 239,000 771,000
Net income $ 1,930,000 $ 2,755,000
Net income per share:    
Basic (in dollars per share) $ 0.53 $ 0.77
Diluted (in dollars per share) $ 0.51 $ 0.74
Weighted average common shares outstanding:    
Basic (in shares) 3,646 3,575
Diluted (in shares) 3,802 3,709