Balance Sheets (USD $)	Sep. 30, 2014	Mar. 31, 2014
ASSETS
Cash and cash equivalents	$ 3,281,500	$ 1,262,300
Marketable securities, short term	14,624,615	12,360,091
Accounts receivable, net of allowance for uncollectible accounts of $15,000	3,678,396	2,331,574
Inventories	3,389,393	3,207,333
Deferred tax assets	169,671	237,387
Prepaid expenses and other assets	848,528	816,276
Total current assets	25,992,103	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	7,495,209	7,030,692
Net fixed assets	2,567,965	3,004,772
Marketable securities, long term	84,551,529	82,022,310
Total assets	113,111,597	105,242,043
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	337,462	374,127
Accrued payroll and other	855,927	808,675
Total current liabilities	1,193,389	1,182,802
Deferred Tax Liabilities, Net, Noncurrent	224,769	354,600
Shareholders' equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,857,953 issued and outstanding as of September 30, 2014 and 4,851,043 issued and outstanding as of March 31, 2014	48,580	48,510
Additional paid-in capital	20,850,762	20,464,883
Accumulated other comprehensive income	567,974	877,857
Retained earnings	90,226,123	82,313,391
Total shareholders' equity	111,693,439	103,704,641
Total liabilities and shareholders' equity	$ 113,111,597	$ 105,242,043