Balance Sheets (Current Period Unaudited) - USD ($)		Dec. 31, 2016	Mar. 31, 2016
Current assets
Cash and cash equivalents		$ 3,799,188	$ 7,534,593	[1]
Marketable securities, short-term		24,655,206	19,697,384	[1]
Accounts receivable, net of allowance for uncollectible accounts of $15,000		1,461,659	2,244,086	[1]
Inventories		3,162,478	3,205,233	[1]
Prepaid expenses and other assets		751,433	734,524	[1]
Total current assets		33,829,964	33,415,820	[1]
Fixed assets
Machinery and equipment		9,020,726	8,840,033	[1]
Leasehold improvements		1,559,719	1,539,965	[1]
		10,580,445	10,379,998	[1]
Less accumulated depreciation and amortization		9,281,531	8,688,285	[1]
Net fixed assets		1,298,914	1,691,713	[1]
Long-term deferred tax assets		446,949	51,188	[1]
Marketable securities, long-term		59,668,735	65,695,335	[1]
Total assets		95,244,562	100,854,056	[1]
Current liabilities
Accounts payable		358,530	317,990	[1]
Accrued payroll and other		679,040	556,674	[1]
Deferred revenue			714,805	[1]
Total current liabilities		1,037,570	1,589,469	[1]
Shareholders’ equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,837,010 issued and outstanding as of December 31, 2016 and 4,835,010 issued and outstanding as of March 31, 2016		48,370	48,350	[1]
Additional paid-in capital	[1]	19,319,679	19,205,682
Accumulated other comprehensive (loss) income		(135,709)	451,359	[1]
Retained earnings		74,974,652	79,559,196	[1]
Total shareholders’ equity		94,206,992	99,264,587	[1]
Total liabilities and shareholders’ equity		$ 95,244,562	$ 100,854,056	[1]

[1] The March 31, 2016 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, 2016.