Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Net sales	$ 9,459,000	$ 6,985,000	$ 27,842,000	$ 22,907,000
Cost of sales	6,221,000	4,914,000	17,170,000	14,560,000
Gross profit	3,238,000	2,071,000	10,672,000	8,347,000
Operating expenses:
General and administrative	1,403,000	1,001,000	4,171,000	3,801,000
Sales and marketing	1,127,000	1,300,000	3,808,000	3,918,000
Research and development	200,000	211,000	483,000	519,000
Total operating expenses	2,730,000	2,512,000	8,462,000	8,238,000
Income (loss) from operations	508,000	(441,000)	2,210,000	109,000
Interest expense, net	(116,000)	(123,000)	(312,000)	(374,000)
Gain on extinguishment of debt	0	1,389,000	0	1,389,000
Income before income taxes	392,000	825,000	1,898,000	1,124,000
Income tax expense (benefit)	6,000	(2,000)	21,000	3,000
Net income	$ 386,000	$ 827,000	$ 1,877,000	$ 1,121,000
Net income per share:
Basic (in dollars per share)	$ 0.06	$ 0.14	$ 0.31	$ 0.18
Diluted (in dollars per share)	$ 0.06	$ 0.13	$ 0.30	$ 0.18
Shares used in calculation of net income per share:
Basic (in shares)	6,183	6,097	6,144	6,060
Diluted (in shares)	6,371	6,222	6,219	6,169