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Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
OPERATING ACTIVITIES    
Net income $ 10,230,490 $ 7,226,073
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 158,851 271,207
Stock-based compensation 47,085 64,237
Deferred income taxes 0 16,539
Changes in operating assets and liabilities:    
Accounts receivable (1,155,585) (911,821)
Inventories (706,214) 81,994
Prepaid expenses and other assets (114,213) (298,099)
Accounts payable and accrued expenses 890,822 172,054
Net cash provided by operating activities 9,351,238 6,458,196
INVESTING ACTIVITIES    
Purchases of fixed assets (24,500) (73,916)
Purchases of marketable securities (25,381,057) 0
Proceeds from maturities of marketable securities 18,750,000 4,000,000
Receipt of tenant improvement allowance 100,000 0
Net cash provided (used) by investing activities (6,555,557) 3,926,084
FINANCING ACTIVITIES    
Payment of dividends to shareholders (9,661,652) (9,666,464)
Cash used in financing activities (9,661,652) (9,666,464)
(Decrease) increase in cash and cash equivalents (6,865,971) 717,816
Cash and cash equivalents at beginning of period 10,449,510 10,427,340
Cash and cash equivalents at end of period 3,583,539 11,145,156
Supplemental disclosures of cash flow information:    
Cash paid during the period for income taxes $ 1,281,629 $ 1,760,000