Balance Sheets (USD $)	Mar. 31, 2014	Mar. 31, 2013
ASSETS
Cash and cash equivalents	$ 1,262,300	$ 2,509,683
Marketable securities, short term	12,360,091	9,711,029
Accounts receivable, net of allowance for uncollectible accounts of $15,000	2,331,574	2,521,395
Inventories	3,207,333	3,336,592
Deferred tax assets	237,387	0
Prepaid expenses and other assets	816,276	958,147
Total current assets	20,214,961	19,036,846
Fixed assets
Machinery and equipment	8,536,010	8,417,061
Leasehold improvements	1,499,454	1,499,454
Gross fixed assets	10,035,464	9,916,515
Less accumulated depreciation	7,030,692	6,228,122
Net fixed assets	3,004,772	3,688,393
Marketable securities, long term	82,022,310	73,040,257
Total assets	105,242,043	95,765,496
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	374,127	422,092
Accrued payroll and other	808,675	918,060
Deferred taxes	0	440,736
Total current liabilities	1,182,802	1,780,888
Long-term deferred tax liabilities	354,600	0
Shareholders' equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,851,043 issued and outstanding as of March 31, 2014 and 4,862,436 issued and outstanding as of March 31, 2013	48,510	48,624
Additional paid-in capital	20,464,883	21,200,742
Accumulated other comprehensive income	877,857	1,557,726
Retained earnings	82,313,391	71,177,516
Total shareholders' equity	103,704,641	93,984,608
Total liabilities and shareholders' equity	$ 105,242,043	$ 95,765,496