Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Sales	$ 69,936	$ 71,396	$ 149,924	$ 158,786
Cost of sales	49,934	46,141	108,061	103,577
Gross profit	20,002	25,255	41,863	55,209
Operating expenses:
General and administrative	6,303	6,200	12,811	13,134
Advertising	4,756	5,300	13,380	12,007
Depreciation	572	552	1,140	1,108
Total operating expenses	11,631	12,052	27,331	26,249
Income from operations	8,371	13,203	14,532	28,960
Other income:
Interest income, net	459	428	1,026	807
Other, net	304	255	561	572
Total other income	763	683	1,587	1,379
Income before provision for income taxes	9,134	13,886	16,119	30,339
Provision for income taxes	2,469	3,134	4,111	7,005
Net income	6,665	10,752	12,008	23,334
Comprehensive income	$ 6,665	$ 10,752	$ 12,008	$ 23,334
Net income per common share:
Basic (in dollars per share)	$ 0.33	$ 0.53	$ 0.60	$ 1.14
Diluted (in dollars per share)	$ 0.33	$ 0.52	$ 0.60	$ 1.14
Weighted average number of common shares outstanding:
Basic (in shares)	19,963	20,463	20,098	20,436
Diluted (in shares)	19,973	20,520	20,109	20,485
Cash dividends declared per common share (in dollars per share)	$ 0.27	$ 0.27	$ 0.54	$ 0.52