STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
OPERATING ACTIVITIES
Net income	$ 8,123,732	$ 9,127,296
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	157,601	154,935
Bonds discount amortization	(124,135)	(40,411)
Provision for credit losses	0	9,514
Stock-based compensation	123,645	116,848
Deferred income taxes	(263,556)	(742,649)
Non-cash operating lease credit	(15,174)	(13,359)
Changes in operating assets and liabilities
Accounts receivable	192,402	3,598,068
Inventories	(259,026)	(550,756)
Prepaid expenses and other assets	156,116	(401,394)
Accounts payable	42,923	(37,476)
Accrued payroll and other	(148,941)	(835,798)
Net cash provided by operating activities	7,985,587	10,384,818
INVESTING ACTIVITIES
Purchases of fixed assets	(1,125,437)	(16,731)
Purchases of marketable securities	(6,580,140)	(3,937,835)
Proceeds from maturities of marketable securities	2,200,000	8,400,000
Net cash Provided (used) by investing activities	(5,505,577)	4,445,434
FINANCING ACTIVITIES
(Payments on) proceeds from exercise of stock options	(29)	117,527
Payment of dividends to shareholders	(9,667,352)	(9,664,227)
Net cash used in financing activities	(9,667,381)	(9,546,700)
Decrease (increase) in cash and cash equivalents	(7,187,371)	5,283,552
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance	10,283,550	1,669,896
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance	3,096,179	6,953,448
Supplemental disclosures of cash flow information
Cash paid during the period for income taxes	$ 1,809,878	$ 3,120,830