Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Sales	$ 66,711	$ 60,791	$ 146,368	$ 133,278
Cost of sales	43,232	42,727	95,424	92,762
Gross profit	23,479	18,064	50,944	40,516
Operating expenses:
General and administrative	6,178	5,747	12,404	11,845
Advertising	4,526	4,382	10,818	10,142
Depreciation	527	204	1,058	398
Total operating expenses	11,231	10,333	24,280	22,385
Income from operations	12,248	7,731	26,664	18,131
Other income:
Interest income, net	143	32	226	60
Other, net	249	23	490	76
Total other income	392	55	716	136
Income before provision for income taxes	12,640	7,786	27,380	18,267
Provision for income taxes	3,880	2,887	9,344	6,774
Net income	8,760	4,899	18,036	11,493
Comprehensive income	$ 8,760	$ 4,899	$ 18,036	$ 11,493
Net income per common share:
Basic (in dollars per share)	$ 0.43	$ 0.24	$ 0.89	$ 0.57
Diluted (in dollars per share)	$ 0.43	$ 0.24	$ 0.88	$ 0.56
Weighted average number of common shares outstanding:
Basic (in shares)	20,349	20,234	20,321	20,208
Diluted (in shares)	20,437	20,377	20,442	20,355
Cash dividends declared per common share (in dollars per share)	$ 0.20	$ 0.19	$ 0.40	$ 0.38