Balance Sheets (Current Period Unaudited) - USD ($)	Sep. 30, 2017	Mar. 31, 2017	[1]
ASSETS
Cash and cash equivalents	$ 5,108,313	$ 8,199,364
Marketable securities, short-term	16,921,738	19,591,833
Accounts receivable, net of allowance for uncollectible accounts of $15,000	2,659,618	3,436,802
Inventories	3,504,478	3,358,298
Prepaid expenses and other assets	523,190	607,283
Total current assets	28,717,337	35,193,580
Fixed assets
Machinery and equipment	9,447,726	9,007,455
Leasehold improvements	1,730,525	1,644,419
	11,178,251	10,651,874
Less accumulated depreciation and amortization	9,555,119	9,238,626
Net fixed assets	1,623,132	1,413,248
Long-term deferred tax assets	432,106	357,055
Marketable securities, long-term	59,622,760	56,810,923
Total assets	90,395,335	93,774,806
LIABILITIES AND SHAREHOLDERS’ EQUITY
Accounts payable	249,697	376,275
Accrued payroll and other	580,838	576,313
Deferred revenue		142,733
Total current liabilities	830,535	1,095,321
Shareholders’ equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,841,010 issued and outstanding as of September 30, 2017 and March 31, 2017	48,410	48,410
Additional paid-in capital	19,548,268	19,507,348
Accumulated other comprehensive income (loss)	29,467	(38,298)
Retained earnings	69,938,655	73,162,025
Total shareholders’ equity	89,564,800	92,679,485
Total liabilities and shareholders’ equity	$ 90,395,335	$ 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.