Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Mar. 31, 2013
Assets
Cash and cash equivalents	$ 6,263,510	$ 4,527,899
Accounts receivable, net of allowance for doubtful accounts of zero and $3,838,092, respectively	682,980	2,212,395
Costs and estimated earnings in excess of billings on uncompleted contracts	445,037	178,264
Inventories	10,255,074	10,998,461
Facility held for sale		1,525,000
Prepaid expenses and other current assets	304,417	309,957
Total current assets	17,951,018	19,751,976
Property and equipment, at cost:
Land	1,683,330	1,683,330
Building	4,516,301	4,516,301
Machinery and equipment	8,208,689	7,771,363
Property, plant and equipment, gross	14,408,320	13,970,994
Less accumulated depreciation	(6,348,064)	(5,507,801)
Net property and equipment	8,060,256	8,463,193
Patent costs, net of accumulated amortization of $872,118 and $845,795, respectively	227,339	206,287
Trademark costs, net of accumulated amortization of $67,595 and $64,230, respectively	107,163	110,528
Other assets	65,880	76,731
Total assets	26,411,656	28,608,715
Liabilities and Stockholders' Equity
Accounts payable	551,701	617,197
Other current liabilities	1,666,114	2,599,435
Short-term deferred compensation under executive employment agreements		524,000
Total current liabilities	2,217,815	3,740,632
Long-term deferred compensation under executive employment agreements	162,165	103,412
Total liabilities	2,379,980	3,844,044
Commitments and contingencies
Stockholders' equity:
Common stock, $.01 par value, 50,000,000 shares authorized; 36,891,654 and 36,664,097 shares issued and outstanding	368,917	366,641
Additional paid-in capital	116,232,596	115,573,331
Accumulated deficit	(92,569,837)	(91,175,301)
Total stockholders' equity	24,031,676	24,764,671
Total liabilities and stockholders' equity	$ 26,411,656	$ 28,608,715