Balance Sheets (USD $)	Dec. 31, 2013	Mar. 31, 2013
ASSETS
Cash and cash equivalents	$ 1,961,285	$ 2,509,683
Marketable securities, short term	10,293,147	9,711,029
Accounts receivable, net of allowance for uncollectible accounts of $15,000	1,789,490	2,521,395
Inventories	3,029,903	3,336,592
Deferred tax assets	241,599	0
Prepaid expenses and other assets	1,220,833	958,147
Total current assets	18,536,257	19,036,846
Fixed assets
Machinery and equipment	8,450,954	8,417,061
Leasehold improvements	1,499,454	1,499,454
Gross fixed assets	9,950,408	9,916,515
Less accumulated depreciation	6,829,363	6,228,122
Net fixed assets	3,121,045	3,688,393
Marketable securities, long term	80,584,799	73,040,257
Total assets	102,242,101	95,765,496
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	285,777	422,092
Accrued payroll and other	833,330	918,060
Deferred taxes	0	440,736
Total current liabilities	1,119,107	1,780,888
Deferred Tax Liabilities, Net, Noncurrent	282,342	0
Shareholders' equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,846,043 issued and outstanding as of December 31, 2013; 4,862,436 issued and outstanding as of March 31, 2013	48,460	48,624
Additional paid-in capital	20,245,775	21,200,742
Accumulated other comprehensive income	795,251	1,557,726
Retained earnings	79,751,166	71,177,516
Total shareholders' equity	100,840,652	93,984,608
Total liabilities and shareholders' equity	$ 102,242,101	$ 95,765,496