Balance Sheets (USD $)	Jun. 30, 2014	Mar. 31, 2014
ASSETS
Cash and cash equivalents	$ 3,313,049	$ 1,262,300
Marketable securities, short term	10,743,412	12,360,091
Accounts receivable, net of allowance for uncollectible accounts of $15,000	3,791,253	2,331,574
Inventories	3,292,756	3,207,333
Deferred tax assets	210,532	237,387
Prepaid expenses and other assets	965,549	816,276
Total current assets	22,316,551	20,214,961
Fixed assets
Machinery and equipment	8,563,720	8,536,010
Leasehold improvements	1,499,454	1,499,454
Gross fixed assets	10,063,174	10,035,464
Less accumulated depreciation	7,261,607	7,030,692
Net fixed assets	2,801,567	3,004,772
Marketable securities, long term	86,192,766	82,022,310
Total assets	111,310,884	105,242,043
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	513,239	374,127
Accrued payroll and other	778,181	808,675
Income taxes payable	1,744,427	0
Total current liabilities	3,035,847	1,182,802
Deferred Tax Liabilities, Net, Noncurrent	438,438	354,600
Shareholders' equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,851,043 issued and outstanding as of June 30, 2014 and March 31, 2014	48,510	48,510
Additional paid-in capital	20,464,883	20,464,883
Accumulated other comprehensive income	972,705	877,857
Retained earnings	86,350,501	82,313,391
Total shareholders' equity	107,836,599	103,704,641
Total liabilities and shareholders' equity	$ 111,310,884	$ 105,242,043