Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 455	$ 788
Accounts receivable, less allowances of $94 and $113, respectively	2,815	3,624
Inventories, net	5,683	5,158
Prepaid expenses and other current assets	393	276
Total current assets	9,346	9,846
Machinery and equipment	3,449	3,489
Demo equipment	1,260	1,101
Furniture and fixtures	225	225
Leasehold improvements	372	372
Property and equipment, at cost	5,306	5,187
Less—accumulated depreciation and amortization	3,996	3,733
Total property and equipment, net	1,310	1,454
Other assets, net	77	77
Total assets	10,733	11,377
Current liabilities:
Accounts payable	1,188	1,300
Accrued expenses	778	728
Accrued compensation	560	656
Deferred revenue	153	130
Capital lease obligations	46	75
Total current liabilities	2,725	2,889
Convertible debt—related party	20,000	17,000
Deferred revenue, net of current portion	61	62
Capital lease obligations, net of current portion		22
Total liabilities	22,786	19,973
Commitments and Contingencies
Stockholders’ deficit:
Common stock, $0.01 par value Authorized—75,000 shares; issued and outstanding—46,414 shares and 46,249 shares, respectively	464	463
Additional paid-in capital	101,146	100,819
Treasury stock at cost, 59 shares and 34 shares of common stock, respectively	(78)	(50)
Accumulated deficit	(113,585)	(109,828)
Total stockholders’ deficit	(12,053)	(8,596)
Total liabilities and stockholders’ deficit	$ 10,733	$ 11,377