Balance Sheets (USD $)	Dec. 31, 2011	Mar. 31, 2011
ASSETS
Cash and cash equivalents	$ 438,332	$ 952,209
Marketable securities, short term	12,090,093	7,970,358
Accounts receivable, net of allowance for uncollectible accounts of $15,000	3,456,042	3,596,239
Inventories	3,317,839	3,343,857
Deferred tax assets	282,144	0
Prepaid expenses and other assets	1,171,038	1,185,306
Total current assets	20,755,488	17,047,969
Fixed assets
Machinery and equipment	6,797,274	6,178,207
Leasehold improvements	693,589	612,682
Gross fixed assets	7,490,863	6,790,889
Less accumulated depreciation	5,558,951	5,259,773
Net fixed assets	1,931,912	1,531,116
Marketable securities, long term	56,384,111	53,257,140
Total assets	79,071,511	71,836,225
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	596,205	731,580
Accrued payroll and other	805,687	987,403
Deferred taxes	0	146,693
Total current liabilities	1,401,892	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	48,247	47,762
Additional paid-in capital	20,974,477	20,894,766
Accumulated other comprehensive income	395,900	1,060,438
Retained earnings	56,250,995	47,967,583
Total shareholders' equity	77,669,619	69,970,549
Total liabilities and shareholders' equity	$ 79,071,511	$ 71,836,225