Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Sales	$ 67,386	$ 75,436	$ 146,698	$ 171,640
Cost of sales	48,212	52,418	105,744	121,837
Gross profit	19,174	23,018	40,954	49,803
Operating expenses:
General and administrative	6,958	6,809	14,999	14,563
Advertising	3,435	5,131	11,108	14,164
Depreciation	694	607	1,341	1,169
Total operating expenses	11,087	12,547	27,448	29,896
Income from operations	8,087	10,471	13,506	19,907
Other income:
Interest income, net	74	66	159	156
Other, net	170	338	454	593
Total other income	244	404	613	749
Income before provision for income taxes	8,331	10,875	14,119	20,656
Provision for income taxes	1,982	2,463	3,342	4,476
Net income	$ 6,349	$ 8,412	$ 10,777	$ 16,180
Net income per common share:
Basic (in dollars per share)	$ 0.31	$ 0.42	$ 0.53	$ 0.81
Diluted (in dollars per share)	$ 0.31	$ 0.42	$ 0.53	$ 0.81
Weighted average number of common shares outstanding used in basic computation (in shares)	20,178	20,063	20,144	20,024
Diluted (in shares)	20,568	20,154	20,384	20,098
Cash dividends declared per common share (in dollars per share)	$ 0.30	$ 0.28	$ 0.60	$ 0.56