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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
OPERATING ACTIVITIES    
Net income $ 6,886,656 $ 8,123,732
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation 174,451 157,601
Bonds discount amortization (175,895) (124,135)
Stock-based compensation 73,150 123,645
Deferred income taxes 742,885 (263,556)
Non-cash operating lease credit 103,931 (15,174)
Changes in operating assets and liabilities    
Accounts receivable 1,148,412 192,402
Inventories 30,240 (259,026)
Prepaid expenses and other assets (729,679) 156,116
Accounts payable 14,835 42,923
Accrued payroll and other (285,774) (148,941)
Net cash provided by operating activities 7,983,212 7,985,587
INVESTING ACTIVITIES    
Purchases of fixed assets (1,128,981) (1,125,437)
Purchases of marketable securities (10,108,982) (6,580,140)
Proceeds from maturities of marketable securities 10,000,000 2,200,000
Net cash used in investing activities (1,237,963) (5,505,577)
FINANCING ACTIVITIES    
Payments on exercise of stock options 0 (29)
Payment of dividends to shareholders (9,674,332) (9,667,352)
Net cash used in financing activities (9,674,332) (9,667,381)
Decrease in cash and cash equivalents (2,929,083) (7,187,371)
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation, Beginning Balance 8,036,564 10,283,550
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation, Ending Balance 5,107,481 3,096,179
Supplemental disclosures of cash flow information    
Cash paid during the period for income taxes $ 1,680,555 $ 1,809,878