Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Sep. 30, 2019		Sep. 30, 2018
OPERATING ACTIVITIES
Net income	$ 7,429,481		$ 8,227,659
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	266,916		357,166
Stock-based compensation	48,360		93,360
Deferred income taxes	75,521		(36,743)
Changes in operating assets and liabilities:
Accounts receivable	(220,147)		(156,451)
Inventories	(90,456)		74,476
Prepaid expenses and other assets	41,687		(15,588)
Accounts payable and other liabilities	(130,726)		(273,761)
Net cash provided by operating activities	7,420,636		8,270,118
INVESTING ACTIVITIES
Purchases of fixed assets	(16,100)		(37,985)
Purchases of marketable securities	(3,013,530)		(6,679,727)
Proceeds from maturities of marketable securities	12,500,000		9,300,000
Cash provided by investing activities	9,470,370		2,582,288
FINANCING ACTIVITIES
Proceeds from sale of common stock			124,450
Payment of dividends to shareholders	(9,692,020)		(9,684,020)
Cash used in financing activities	(9,692,020)		(9,559,570)
Increase in cash and cash equivalents	7,198,986		1,292,836
Cash and cash equivalents at beginning of period	6,877,304	[1]	4,755,082
Cash and cash equivalents at end of period	14,076,290		6,047,918
Supplemental disclosures of cash flow information: Cash paid during the period for income taxes	$ 1,230,000		$ 1,866,045

[1] The March 31, 2019 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, 2019.