CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash Flows from Operating Activities:
Net loss	$ (1,632,000)	$ (1,533,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,679,000	1,960,000
Amortization of deferred financing costs	97,000	97,000
Interest expense on second funding liability		80,000
Provision for allowance for doubtful accounts	194,000
Inventory write-down (recovery)	573,000	(52,000)
Provision for warranty expenses	2,342,000	961,000
Loss on disposal of equipment		20,000
Stock-based compensation	862,000	1,333,000
Change in fair value of warrant liability	(14,220,000)	(16,181,000)
Changes in operating assets and liabilities:
Accounts receivable	(4,077,000)	(6,226,000)
Inventories	(4,583,000)	1,774,000
Prepaid expenses and other current assets	322,000	(1,763,000)
Accounts payable and accrued expenses	(501,000)	(818,000)
Accrued salaries and wages and long term liabilities	26,000	(274,000)
Accrued warranty reserve	(1,924,000)	(1,137,000)
Deferred revenue	1,052,000	599,000
Net cash used in operating activities	(19,790,000)	(21,160,000)
Cash Flows from Investing Activities:
Acquisition of and deposits on equipment and leasehold improvements	(689,000)	(616,000)
Changes in restricted cash	1,250,000	(5,000,000)
Net cash provided by (used in) investing activities	561,000	(5,616,000)
Cash Flows from Financing Activities:
Net proceeds (repayment) from revolving credit facility	5,255,000	(134,000)
Repayment of notes payable and capital lease obligations	(197,000)	(96,000)
Net cash (used in) proceeds from employee stock-based transactions	(33,000)	6,000
Proceeds from exercise of common stock warrants	1,083,000
Net cash provided by (used in) financing activities	6,108,000	(224,000)
Net decrease in Cash and Cash Equivalents	(13,121,000)	(27,000,000)
Cash and Cash Equivalents, Beginning of Period	33,456,000	47,270,000
Cash and Cash Equivalents, End of Period	20,335,000	20,270,000
Cash paid during the period for:
Interest	318,000	339,000
Income taxes	0
Supplemental Disclosures of Non-Cash Information:
Fixed asset purchases included in accounts payable	37,000	27,000
Issuance of common stock to Calnetix Power Solutions, Inc., acquisition of the Calnetix microturbine generator product line (in shares)		3,131,313
Fair value of the remaining consideration to be paid in connection with the acquisition of the Calnetix microturbine generator line		$ 3,100,000