Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Mar. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly financial data (unaudited)

Quarter Ended:	June 30, 2016		September 30, 2016		December 31, 2016		March 31, 2017
Sales	$	72,487	$	60,791	$	52,866	$	63,032
Gross Profit	$	22,452	$	18,064	$	16,643	$	22,155
Income from operations	$	10,400	$	7,731	$	7,655	$	11,697
Net income	$	6,594	$	4,899	$	4,823	$	7,503
Diluted net income per common share	$	0.32	$	0.24	$	0.24	$	0.37
Quarter Ended:	June 30, 2015		September 30, 2015		December 31, 2015		March 31, 2016
Sales	$	71,634	$	56,725	$	50,933	$	55,392
Gross Profit	$	22,966	$	18,913	$	16,754	$	17,663
Income from operations	$	9,091	$	7,090	$	7,622	$	8,585
Net income	$	5,757	$	4,502	$	4,890	$	5,418
Diluted net income per common share	$	0.29	$	0.22	$	0.24	$	0.27