v3.26.1
CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Operating activities:    
Net loss $ (391,464) $ (874,831)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Provision for credit losses 0 121
Depreciation of equipment and leasehold improvements 295,154 237,210
Net accretion of discount on treasury securities (157,639) (222,880)
Amortization of finance lease right-of-use asset 10,572  
Noncash operating lease expense 7,670 7,669
Stock-based compensation expense 24,933 31,782
Change in cash surrender value of life insurance (243,473) (215,012)
Provision for deferred compensation 235,831 133,330
Net changes in operating assets and liabilities:    
Accounts receivable (86,088) 72,526
Inventories 292,977 (411,387)
Prepaid expenses and other current assets 502,096 343,107
Interest receivable 10,511 49,251
Income taxes receivable 18,793 5,577
Income taxes payable 1,023 7,059
Accounts payable (525,673) 489,501
Accrued liabilities 425,347 119,282
Deferred revenue 18,637 12,787
Net cash provided by (used in) operating activities 439,207 (214,908)
Investing activities:    
Purchase of equipment and leasehold improvements (316,486) (490,717)
Life insurance premiums paid (51,301) (70,577)
Proceeds from the maturity of treasury securities 14,041,000 14,303,000
Purchases of maturity of treasury securities (13,910,710) (13,861,990)
Net cash used in investing activities (237,497) (120,284)
Financing activities:    
Proceeds from exercise of stock options 21,100 305,908
Principal payments on finance lease obligations (9,767)  
Net cash provided by financing activities 11,333 305,908
Net increase (decrease) in cash and cash equivalents 213,043 (29,284)
Cash and cash equivalents at beginning of year 2,807,797 2,837,081
Cash and cash equivalents at end of year 3,020,840 2,807,797
Supplemental cash flow information:    
Right of use assets obtained in exchange for finance lease liabilities 31,716  
Cash paid for interest on finance lease liability 2,116  
Cash paid (refunded) for income taxes, net (8,923) 4,846
Pennsylvania [Member]    
Supplemental cash flow information:    
Cash paid (refunded) for income taxes, net (16,000)  
New York [Member]    
Supplemental cash flow information:    
Cash paid (refunded) for income taxes, net 2,533 1,617
Texas [Member]    
Supplemental cash flow information:    
Cash paid (refunded) for income taxes, net 1,368 1,998
Massachusetts [Member]    
Supplemental cash flow information:    
Cash paid (refunded) for income taxes, net 1,580 925
New Jersey [Member]    
Supplemental cash flow information:    
Cash paid (refunded) for income taxes, net 1,250 1,518
California [Member]    
Supplemental cash flow information:    
Cash paid (refunded) for income taxes, net   1,600
North Carolina [Member]    
Supplemental cash flow information:    
Cash paid (refunded) for income taxes, net   1,054
Wisconsin [Member]    
Supplemental cash flow information:    
Cash paid (refunded) for income taxes, net   (4,176)
Other Tax Authority [Member]    
Supplemental cash flow information:    
Cash paid (refunded) for income taxes, net $ 346 $ 311