Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2017	Mar. 31, 2017	[1]
ASSETS
Cash and cash equivalents	$ 4,377,913	$ 8,199,364
Marketable securities, short-term	26,863,050	19,591,833
Accounts receivable, net of allowance for uncollectible accounts of $15,000	3,130,966	3,436,802
Inventories	3,248,745	3,358,298
Prepaid expenses and other assets	597,949	607,283
Total current assets	38,218,623	35,193,580
Fixed assets
Machinery and equipment	9,354,253	9,007,455
Leasehold improvements	1,691,019	1,644,419
	11,045,272	10,651,874
Less accumulated depreciation and amortization	9,392,814	9,238,626
Net fixed assets	1,652,458	1,413,248
Long-term deferred tax assets	409,866	357,055
Marketable securities, long-term	53,347,770	56,810,923
Total assets	93,628,717	93,774,806
LIABILITIES AND SHAREHOLDERS’ EQUITY
Accounts payable	344,391	376,275
Accrued payroll and other	581,484	576,313
Income taxes payable	1,476,092
Deferred revenue	35,633	142,733
Total current liabilities	2,437,600	1,095,321
Shareholders’ equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,841,010 issued and outstanding as of June 30, 2017 and March 31, 2017	48,410	48,410
Additional paid-in capital	19,507,348	19,507,348
Accumulated other comprehensive income (loss)	16,729	(38,298)
Retained earnings	71,618,630	73,162,025
Total shareholders’ equity	91,191,117	92,679,485
Total liabilities and shareholders’ equity	$ 93,628,717	$ 93,774,806

[1] The March 31, 2017 Balance Sheet is derived from the audited financial statements contained in our Annual Report on Form 10-K for the fiscal year ended March 31, 2017.