Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Sales	$ 59,915	$ 60,068	$ 209,839	$ 218,854
Cost of sales	42,218	40,687	150,279	144,264
Gross profit	17,697	19,381	59,560	74,590
Operating expenses:
General and administrative	6,040	5,793	18,851	18,927
Advertising	3,163	3,619	16,543	15,626
Depreciation	562	556	1,702	1,664
Total operating expenses	9,765	9,968	37,096	36,217
Income from operations	7,932	9,413	22,464	38,373
Other income:
Interest income, net	421	508	1,447	1,315
Other, net	301	255	862	827
Total other income	722	763	2,309	2,142
Income before provision for income taxes	8,654	10,176	24,773	40,515
Provision for income taxes	1,814	2,389	5,925	9,394
Net income	6,840	7,787	18,848	31,121
Comprehensive income	$ 6,840	$ 7,787	$ 18,848	$ 31,121
Net income per common share:
Basic (in dollars per share)	$ 0.34	$ 0.38	$ 0.94	$ 1.52
Diluted (in dollars per share)	$ 0.34	$ 0.38	$ 0.94	$ 1.52
Weighted average number of common shares outstanding:
Basic (in shares)	19,984	20,483	20,060	20,452
Diluted (in shares)	19,994	20,493	20,071	20,487
Cash dividends declared per common share (in dollars per share)	$ 0.27	$ 0.27	$ 0.81	$ 0.79