Balance Sheets (Current Period Unaudited) - USD ($)	Sep. 30, 2021	Mar. 31, 2021	[1]
Current assets
Cash and cash equivalents	$ 11,145,156	$ 10,427,340
Marketable securities, short-term	22,660,959	7,678,957
Accounts receivable, net of allowance for uncollectible accounts of $15,000	2,876,102	1,964,281
Inventories	3,982,771	3,900,777
Prepaid expenses and other assets	752,764	391,278
Total current assets	41,417,752	24,362,633
Fixed assets
Machinery and equipment	9,328,581	9,254,664
Leasehold improvements	1,810,872	1,810,872
Property, Plant and Equipment, Gross, Ending Balance	11,139,453	11,065,536
Less accumulated depreciation and amortization	10,855,501	10,728,853
Net fixed assets	283,952	336,683
Deferred tax assets	137,439	73,538
Marketable securities, long-term	27,544,468	47,038,669
Right-of-use asset – operating lease	625,829	689,216
Total assets	70,009,440	72,500,739
Current liabilities
Accounts payable	411,218	336,591
Accrued payroll and other	701,705	540,474
Operating lease	151,955	150,273
Total current liabilities	1,264,878	1,027,338
Operating lease	515,973	581,459
Total liabilities	1,780,851	1,608,797
Shareholders’ equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,833,232 issued and outstanding as of September 30 and March 31, 2021	48,332	48,332
Additional paid-in capital	19,402,364	19,338,127
Accumulated other comprehensive income	813,920	1,101,119
Retained earnings	47,963,973	50,404,364
Total shareholders’ equity	68,228,589	70,891,942
Total liabilities and shareholders’ equity	$ 70,009,440	$ 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.