Consolidated Statements of Cash Flows - Scenario, Unspecified [Domain] - USD ($)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (24,000)	$ (420,000)	$ 4,164,000
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Loss on extinguishment of debt			51,000
Loss on disposal of equipment and leasehold improvements	$ 127,000	$ 46,000	46,000
Depreciation and amortization	1,243,000	1,086,000	847,000
Amortization of debt issue costs and other assets	56,000	43,000	94,000
Share based compensation expense	$ 741,000	$ 770,000	730,000
Reduction of allowance for doubtful accounts			(10,000)
Reduction of inventory reserve	$ (2,000)	$ (3,000)	(32,000)
Deferred income tax expense (benefit)	163,000	68,000	(2,121,000)
Net (increase) decrease in assets:
Accounts receivable	(882,000)	1,132,000	(1,259,000)
Inventories	(335,000)	(1,510,000)	(157,000)
Prepaid expenses and other assets	22,000	(249,000)	(92,000)
Net increase (decrease) in liabilities:
Customer deposits	1,000	(3,000)	(16,000)
Accounts payable	(219,000)	1,332,000	126,000
Accrued expenses	$ 348,000	(130,000)	(483,000)
Deferred rent		(13,000)	9,000
Net cash provided by operating activities	$ 1,239,000	2,149,000	1,897,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in equipment and leasehold improvements	(4,298,000)	(4,117,000)	(3,894,000)
Proceeds from (investment in) restricted cash	882,000	1,992,000	(3,360,000)
Net cash used in investing activities	(3,416,000)	(2,125,000)	(7,254,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock and exercise of stock options	215,000	$ 40,000	23,000
Proceeds from long-term debt, net of costs	86,000		5,531,000
Principal payments on long-term debt	$ (210,000)	$ (116,000)	(635,000)
Payments for debt issuance costs			(259,000)
Net cash provided by (used in) financing activities	$ 91,000	$ (76,000)	4,660,000
Net decrease in cash and cash equivalents	(2,086,000)	(52,000)	(697,000)
Cash and cash equivalents at beginning of year	4,312,000	4,364,000	5,061,000
Cash and cash equivalents at end of year	2,226,000	4,312,000	4,364,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest	294,000	259,000	117,000
Income taxes	$ 8,000	$ 132,000	$ 73,000