Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014
Current assets:
Cash and cash equivalents	$ 1,395	$ 1,237
Accounts receivable, less allowances of $133 and $117, respectively	2,920	3,818
Inventories, net	4,221	4,194
Prepaid expenses and other current assets	460	455
Total current assets	8,996	9,704
Machinery and equipment	3,447	3,456
Demo equipment	1,469	1,311
Furniture and fixtures	247	225
Leasehold improvements	372	372
Property and equipment, at cost	5,535	5,364
Less—accumulated depreciation and amortization	4,549	4,302
Total property and equipment, net	986	1,062
Other assets, net	67	67
Total assets	10,049	10,833
Current liabilities:
Accounts payable	1,405	1,217
Accrued expenses	880	918
Accrued compensation	514	474
Deferred revenue	310	210
Capital lease obligations		22
Total current liabilities	3,109	2,841
Convertible debt—related party, net of discount	24,480	22,414
Deferred revenue, net of current portion	128	93
Total liabilities	27,717	25,348
Commitments and Contingencies
Stockholders’ deficit:
Preferred stock, $0.01 par value Authorized—5,000 shares; issued and outstanding - none	0	0
Common stock, $0.01 par value Authorized—100,000 shares; issued and outstanding—47,793 shares and 47,614 shares, respectively	478	476
Additional paid-in capital	103,000	102,629
Treasury stock at cost, 65 shares and 59 shares of common stock, respectively	(85)	(78)
Accumulated deficit	(121,061)	(117,542)
Total stockholders’ deficit	(17,668)	(14,515)
Total liabilities and stockholders’ deficit	$ 10,049	$ 10,833