Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Sales	$ 309,215	$ 284,125	$ 283,419
Cost of sales	219,267	202,879	188,105
Gross profit	89,948	81,246	95,314
Operating expenses:
General and administrative	28,293	25,264	24,767
Advertising	21,641	22,748	22,148
Depreciation	2,427	2,257	2,225
Total operating expenses	52,361	50,269	49,140
Income from operations	37,587	30,977	46,174
Other income (expense):
Interest income, net	314	1,747	1,864
Other, net	1,315	1,169	1,083
Total other income	1,629	2,916	2,947
Income before provision for income taxes	39,216	33,893	49,121
Provision for income taxes	8,613	8,042	11,381
Net income	$ 30,603	$ 25,851	$ 37,740
Net income per common share:
Basic (in dollars per share)	$ 1.53	$ 1.29	$ 1.84
Diluted (in dollars per share)	$ 1.52	$ 1.29	$ 1.84
Weighted average number of common shares outstanding:
Basic (in shares)	20,060	20,041	20,461
Diluted (in shares)	20,119	20,055	20,491
Cash dividends declared per common share (in dollars per share)	$ 1.12	$ 1.08	$ 1.06