Consolidated Statements Of Cash Flows (USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net loss	$ (916,354)	$ (1,287,434)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	306,307	330,430
Gain on sale of facility held for sale	(40,032)
Non-cash equity based compensation	162,724	200,841
Change in operating assets and liabilities:
Accounts receivable and costs and estimated earnings in excess of billings on uncompleted contracts	(403,124)	(658,771)
Inventories	239,539	(1,654,196)
Prepaid expenses and other current assets	(6,160)	(218,233)
Accounts payable and other current liabilities	97,217	(1,431)
Billings in excess of costs and estimated earnings on uncompleted contracts		238,473
Deferred compensation under executive employment agreements	18,882	(125,865)
Net cash used in operating activities	(541,001)	(3,176,186)
Cash flows from investing activities:
Purchases of short-term investments		(127)
Maturities of short-term investments		433,058
Increase in other long-term assets	(152)	(143)
Acquisition of property and equipment	(242,478)	(204,149)
Property and equipment reimbursements received from DOE under grant	24,939	44,145
Cash proceeds from sale of facility held for sale	1,565,032
Increase in patent and trademark costs	(3,112)	(1,029)
Net cash provided by investing activities	1,344,229	271,755
Cash flows from financing activities:
Issuance of common stock under employee stock purchase plan	3,572	32,301
Purchase of treasury stock		(16,654)
Net cash provided by financing activities	3,572	15,647
Increase (decrease) in cash and cash equivalents	806,800	(2,888,784)
Cash and cash equivalents at beginning of quarter	4,527,899	11,637,940
Cash and cash equivalents at end of quarter	$ 5,334,699	$ 8,749,156