Balance Sheets (Current Period Unaudited) - USD ($)	Dec. 31, 2021	Mar. 31, 2021	[1]
Current assets
Cash and cash equivalents	$ 8,967,657	$ 10,427,340
Marketable securities, short-term	22,482,494	7,678,957
Accounts receivable, net of allowance for uncollectible accounts of $15,000	3,038,203	1,964,281
Inventories	4,367,675	3,900,777
Prepaid expenses and other assets	921,846	391,278
Total current assets	39,777,875	24,362,633
Fixed assets
Machinery and equipment	9,312,982	9,254,664
Leasehold improvements	1,810,872	1,810,872
Property, Plant and Equipment, Gross, Ending Balance	11,123,854	11,065,536
Less accumulated depreciation and amortization	10,886,378	10,728,853
Net fixed assets	237,476	336,683
Deferred tax assets	260,134	73,538
Marketable securities, long-term	27,179,552	47,038,669
Right-of-use asset – operating lease	593,715	689,216
Total assets	68,048,752	72,500,739
Current liabilities
Accounts payable	111,243	336,591
Accrued payroll and other	812,502	540,474
Operating lease	152,807	150,273
Total current liabilities	1,076,552	1,027,338
Operating lease	482,798	581,459
Total liabilities	1,559,350	1,608,797
Shareholders’ equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,833,714 issued and outstanding as of December 31, 2021 and 4,833,232 as of March 31, 2021	48,337	48,332
Additional paid-in capital	19,411,158	19,338,127
Accumulated other comprehensive income	433,759	1,101,119
Retained earnings	46,596,148	50,404,364
Total shareholders’ equity	66,489,402	70,891,942
Total liabilities and shareholders’ equity	$ 68,048,752	$ 72,500,739

[1] The March 31, 2021 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, 2021.