CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Sales	$ 72,487	$ 71,634
Cost of sales	50,035	48,668
Gross profit	22,452	22,966
Operating expenses:
General and administrative	6,098	5,799
Advertising	5,760	7,885
Depreciation	194	191
Total operating expenses	12,052	13,875
Income from operations	10,400	9,091
Other income:
Interest income, net	28	50
Other, net	53	(4)
Total other income	81	46
Income before provision for income taxes	10,481	9,137
Provision for income taxes	3,887	3,380
Net income	6,594	5,757
Net change in unrealized loss on short term investments		(35)
Comprehensive income	$ 6,594	$ 5,722
Net income per common share:
Basic (in dollars per share)	$ 0.33	$ 0.29
Diluted (in dollars per share)	$ 0.32	$ 0.29
Weighted average number of common shares outstanding:
Basic (in shares)	20,181	20,074
Diluted (in shares)	20,333	20,198
Cash dividends declared per common share	$ 0.19	$ 0.18