Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Dec. 31, 2019		Dec. 31, 2018
OPERATING ACTIVITIES
Net income	$ 11,160,145		$ 11,649,064
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	403,691		531,685
Stock-based compensation	48,360		93,360
Deferred income taxes	71,800		(30,648)
Changes in operating assets and liabilities:
Accounts receivable	876,601		171,051
Inventories	105,134		(491,042)
Prepaid expenses and other assets	80,746		(120,646)
Accounts payable and other liabilities	(210,172)		(123,775)
Net cash provided by operating activities	12,536,305		11,679,049
INVESTING ACTIVITIES
Purchases of fixed assets	(26,076)		(68,265)
Purchases of marketable securities	(7,196,330)		(11,649,227)
Proceeds from maturities of marketable securities	12,500,000		15,800,000
Cash provided by investing activities	5,277,594		4,082,508
FINANCING ACTIVITIES
Proceeds from sale of common stock			217,940
Payment of dividends to shareholders	(14,538,030)		(14,528,030)
Cash used in financing activities	(14,538,030)		(14,310,090)
Increase in cash and cash equivalents	3,275,869		1,451,467
Cash and cash equivalents at beginning of period	6,877,304	[1]	4,755,082
Cash and cash equivalents at end of period	10,153,173		6,206,549
Cash paid during the period for income taxes	$ 1,931,661		$ 2,696,045

[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.