Restatement of Previously Issued Financial Statements - Consolidated Statements of Operation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Sales	$ 70,999	$ 65,260	$ 149,243	$ 135,302
Cost of sales	50,937	46,943	106,655	97,187
Gross profit	20,062	18,317	42,588	38,115
Operating expenses:
General and administrative	11,962	9,859	27,673	19,244
Advertising	5,512	3,879	12,777	10,228
Depreciation and amortization	1,713	858	3,391	1,611
Total operating expenses	19,187	14,596	43,841	31,083
Income (loss) from operations	875	3,721	(1,253)	7,032
Other income (expense):
Interest income (expense), net	151	(14)	345	(288)
Other, net	254	261	760	459
Total other income	405	247	1,105	171
Income (loss) before provision for income taxes	1,280	3,968	(148)	7,203
Provision for income taxes	565	1,087	273	1,635
Net income (loss)	$ 715	$ 2,881	$ (421)	$ 5,568
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.04	$ 0.14	$ (0.02)	$ 0.28
Diluted (in dollars per share)	$ 0.03	$ 0.14	$ (0.02)	$ 0.27
Weighted average number of common shares outstanding:
Basic (in shares)	20,382,979	20,261,114	20,357,752	20,234,904
Diluted (in shares)	20,780,455	20,343,980	20,357,752	20,317,522
Cash dividends declared per common share (in dollars per share)	$ 0.30	$ 0.30	$ 0.60	$ 0.60
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Sales	$ 70,999	$ 65,394	$ 149,243	$ 135,581
Cost of sales	50,937	46,943	106,655	97,187
Gross profit	20,062	18,451	42,588	38,394
Operating expenses:
General and administrative	13,278	10,753	28,989	20,104
Advertising	5,512	3,879	12,777	10,228
Depreciation and amortization	1,713	858
Total operating expenses	20,503	15,490	45,157	31,943
Income (loss) from operations	(441)	2,961	(2,569)	6,451
Other income (expense):
Interest income (expense), net	570	388	1,190	505
Other, net	254	261	760	459
Total other income	824	649	1,950	964
Income (loss) before provision for income taxes	383	3,610	(619)	7,415
Provision for income taxes	453	1,031	338	2,061
Net income (loss)	$ (70)	$ 2,579	$ (957)	$ 5,354
Net income (loss) per common share:
Basic (in dollars per share)	$ 0	$ 0.13	$ (0.05)	$ 0.26
Diluted (in dollars per share)	$ 0	$ 0.13	$ (0.05)	$ 0.26
Weighted average number of common shares outstanding:
Basic (in shares)	20,382,979	20,261,114	20,357,752	20,234,904
Diluted (in shares)	20,382,979	20,343,980	20,357,752	20,317,522
Cash dividends declared per common share (in dollars per share)	$ 0.30	$ 0.30	$ 0.60	$ 0.60
Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Sales	$ 0	$ (134)	$ 0	$ (279)
Cost of sales	0	0	0	0
Gross profit	0	(134)	0	(279)
Operating expenses:
General and administrative	(1,316)	(894)	(1,316)	(860)
Advertising	0	0	0	0
Depreciation and amortization	0	0
Total operating expenses	(1,316)	(894)	(1,316)	(860)
Income (loss) from operations	1,316	760	1,316	581
Other income (expense):
Interest income (expense), net	(419)	(402)	(845)	(793)
Other, net	0	0	0	0
Total other income	(419)	(402)	(845)	(793)
Income (loss) before provision for income taxes	897	358	471	(212)
Provision for income taxes	112	56	(65)	(426)
Net income (loss)	$ 785	$ 302	$ 536	$ 214
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.04	$ 0.01	$ 0.03	$ 0.02
Diluted (in dollars per share)	$ 0.04	$ 0.01	$ 0.03	$ 0.01
Weighted average number of common shares outstanding:
Basic (in shares)	0	0	0	0
Diluted (in shares)	397,476	0	0	0
Cash dividends declared per common share (in dollars per share)	$ 0	$ 0	$ 0	$ 0