Balance Sheets (USD $)	Jun. 30, 2013	Mar. 31, 2013
ASSETS
Cash and cash equivalents	$ 2,270,943	$ 2,509,683
Marketable securities, short term	9,913,371	9,711,029
Accounts receivable, net of allowance for uncollectible accounts of $15,000	2,470,003	2,521,395
Inventories	3,231,940	3,336,592
Deferred tax assets	250,809	0
Prepaid expenses and other assets	1,060,094	958,147
Total current assets	19,197,160	19,036,846
Fixed assets
Machinery and equipment	8,417,061	8,417,061
Leasehold improvements	1,499,454	1,499,454
Gross fixed assets	9,916,515	9,916,515
Less accumulated depreciation	6,418,258	6,228,122
Net fixed assets	3,498,257	3,688,393
Marketable securities, long term	75,352,422	73,040,257
Total assets	98,047,839	95,765,496
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	338,633	422,092
Accrued payroll and other	733,982	918,060
Income taxes payable	1,044,404	0
Deferred taxes	0	440,736
Total current liabilities	2,117,019	1,780,888
Deferred Tax Liabilities, Net, Noncurrent	234,422	0
Shareholders' equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,860,436 issued and outstanding as of December 31, 2012 and 4,824,745 issued and outstanding as of March 31, 2012	48,624	48,624
Additional paid-in capital	21,200,742	21,200,742
Accumulated other comprehensive income	702,691	1,557,726
Retained earnings	73,744,341	71,177,516
Total shareholders' equity	95,696,398	93,984,608
Total liabilities and shareholders' equity	$ 98,047,839	$ 95,765,496