Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
OPERATING ACTIVITIES
Net income	$ 4,140,116	$ 3,579,566
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	87,621	140,427
Stock-based compensation	7,134	7,238
Deferred income taxes	1	(2,868)
Changes in operating assets and liabilities:
Accounts receivable	1,191,613	(1,355,557)
Inventories	(455,402)	230,751
Prepaid expenses and other assets	(268,772)	(235,406)
Accounts payable and other liabilities	(1,371,168)	936,243
Net cash provided by operating activities	3,331,143	3,300,394
INVESTING ACTIVITIES
Purchases of fixed assets	(24,500)	(25,679)
Purchases of marketable securities	(4,976,063)	0
Proceeds from maturities of marketable securities	9,250,000	0
Receipt of tenant improvement allowance	(100,000)	0
Net cash provided (used) by investing activities	4,349,437	(25,679)
FINANCING ACTIVITIES
Payment of dividends to shareholders	(4,830,826)	(4,833,232)
Cash used in financing activities	(4,830,826)	(4,833,232)
Increase (decrease) in cash and cash equivalents	2,849,754	(1,558,517)
Cash and cash equivalents at beginning of period	10,449,510	10,427,340
Cash and cash equivalents at end of period	13,299,264	8,868,823
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	$ 1,275,629	$ 0