Balance Sheets (USD $)	Sep. 30, 2011	Mar. 31, 2011
ASSETS
Cash and cash equivalents	$ 1,324,236	$ 952,209
Marketable securities, short term	11,122,455	7,970,358
Accounts receivable, net of allowance for uncollectible accounts of $15,000	2,971,539	3,596,239
Inventories	3,382,028	3,343,857
Deferred tax assets	119,603	0
Prepaid expenses and other assets	1,354,995	1,185,306
Total current assets	20,274,856	17,047,969
Fixed assets
Machinery and equipment	6,471,536	6,178,207
Leasehold improvements	612,682	612,682
Gross fixed assets	7,084,218	6,790,889
Less accumulated depreciation	5,494,150	5,259,773
Net fixed assets	1,590,068	1,531,116
Marketable securities, long term	55,149,907	53,257,140
Total assets	77,014,831	71,836,225
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	545,408	731,580
Accrued payroll and other	849,335	987,403
Deferred taxes	0	146,693
Total current liabilities	1,394,743	1,865,676
Shareholders' equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,776,198 issued and outstanding as of September 30 and March 31, 2011	47,762	47,762
Additional paid-in capital	20,974,926	20,894,766
Accumulated other comprehensive income	635,496	1,060,438
Retained earnings	53,961,904	47,967,583
Total shareholders' equity	75,620,088	69,970,549
Total liabilities and shareholders' equity	$ 77,014,831	$ 71,836,225