Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES
Net income	$ 10,691,481	$ 8,559,914
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	358,828	386,968
Stock-based compensation	73,036	41,297
Deferred income taxes	319	(73,269)
Changes in operating assets and liabilities:
Accounts receivable	(1,073,922)	(467,290)
Inventories	(466,898)	41,973
Prepaid expenses and other assets	(435,067)	181,557
Accounts payable and other liabilities	(49,447)	(140,082)
Net cash provided by operating activities	9,098,330	8,531,068
INVESTING ACTIVITIES
Purchases of fixed assets	(58,317)
Proceeds from maturities of marketable securities	4,000,000	12,000,000
Cash provided by investing activities	3,941,683	11,986,373
FINANCING ACTIVITIES
Repurchase of common stock	0	(91,419)
Payment of dividends to shareholders	(14,499,696)	(14,503,308)
Cash used in financing activities	(14,499,696)	(14,594,727)
(Decrease) increase in cash and cash equivalents	(1,459,683)	5,922,714
Cash and cash equivalents at beginning of period	10,427,340	8,065,594
Cash and cash equivalents at end of period	8,967,657	13,988,308
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	$ 2,490,000	$ 1,636,788