Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 387,000	$ (3,596,000)	$ 1,025,000
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Loss on sale or disposal of assets			106,000
Depreciation and amortization	1,934,000	1,908,000	1,877,000
Amortization of debt issue costs and other assets	80,000	71,000	72,000
Amortization of operating leases right-of-use assets	294,000
Share-based compensation expense	577,000	322,000	400,000
Net (increase) decrease in assets:
Accounts receivable	(172,000)	682,000	(529,000)
Inventories	1,621,000	(2,240,000)	(1,062,000)
Prepaid expenses and other assets	41,000	64,000	(139,000)
Net increase (decrease) in liabilities:
Accounts payable	(2,785,000)	1,395,000	(139,000)
Accrued expenses	(143,000)	100,000	(121,000)
Customer deposits	(299,000)	493,000	13,000
Operating lease obligations	(289,000)
Deferred rent and other liabilities	(3,000)	(46,000)	(13,000)
Net cash provided by (used in) operating activities	1,243,000	(847,000)	1,490,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in equipment and leasehold improvements	(224,000)	(431,000)	(1,005,000)
Cash paid to acquire Cellana assets		(100,000)
Net cash used in investing activities	(224,000)	(531,000)	(1,005,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on short-term contract obligation	(247,000)	(110,000)
Net draws (payments) on line of credit		1,500,000	(111,000)
Proceeds from long-term debt – related party	1,500,000
Proceeds from long-term debt, net of costs			166,000
Principal payments on long-term debt	(611,000)	(576,000)	(538,000)
Payments on capitalized leases	(57,000)	(66,000)	(90,000)
Shares withheld for tax payments	(31,000)	(32,000)
Proceeds from issuance of common stock and exercise of stock options	4,000	108,000	75,000
Net cash provided by (used in) financing activities	558,000	824,000	(498,000)
Net increase (decrease) in cash	1,577,000	(554,000)	(13,000)
Cash and restricted cash at beginning of year	840,000	1,394,000	1,407,000
Cash and restricted cash at end of year	2,417,000	840,000	1,394,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest	618,000	380,000	413,000
Income taxes
Non-cash financing activities:
Less: Issuance of short-term obligation		(395,000)
Cash paid to acquire Cellana assets		100,000
Cellana Asset Purchase [Member]
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid to acquire Cellana assets		(100,000)
Non-cash financing activities:
Purchase of Cellana assets		495,000
Cash paid to acquire Cellana assets		$ 100,000