Balance Sheets (USD $)	Jun. 30, 2011	Mar. 31, 2011
ASSETS
Cash and cash equivalents	$ 1,677,431	$ 952,209	[1]
Marketable securities, short term	9,599,679	7,970,358	[1]
Accounts receivable, net of allowance for uncollectible accounts of $15,000	3,402,982	3,596,239	[1]
Inventories	3,368,728	3,343,857	[1]
Prepaid expenses and other assets	1,037,664	1,185,306	[1]
Total current assets	19,086,484	17,047,969	[1]
Fixed assets
Machinery and equipment	6,376,673	6,178,207	[1]
Leasehold improvements	612,682	612,682	[1]
Gross fixed assets	6,989,355	6,790,889	[1]
Less accumulated depreciation	5,372,405	5,259,773	[1]
Net fixed assets	1,616,950	1,531,116	[1]
Marketable securities, long term	55,938,489	53,257,140	[1]
Total assets	76,641,923	71,836,225	[1]
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	724,420	731,580	[1]
Accrued payroll and other	832,950	987,403	[1]
Income taxes payable	1,374,763
Deferred taxes	198,723	146,693	[1]
Total current liabilities	3,130,856	1,865,676	[1]
Shareholders' equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,776,198 issued and outstanding as of June 30 and March 31, 2011	47,762	47,762	[1]
Additional paid-in capital	20,894,766	20,894,766	[1]
Accumulated other comprehensive income	1,161,728	1,060,438	[1]
Retained earnings	51,406,811	47,967,583	[1]
Total shareholders' equity	73,511,067	69,970,549	[1]
Total liabilities and shareholders' equity	$ 76,641,923	$ 71,836,225	[1]

[1] The March 31, 2011 Balance Sheet is derived from the audited financial statements contained in our Annual Report on Form 10-K for the fiscal year ended March 31, 2011.