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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income $ 1,819,529 $ 1,665,155
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 243,746 280,211
Amortization of operating right of use asset 0 15,577
Stock compensation expense 101,023 100,044
Bad debt expense 225,000 150,000
(Increase) decrease in:    
Accounts receivables (245,439) (259,388)
Long-term receivables, prepaids and other assets (265,761) 6,455
Increase (decrease) in:    
Accounts payable 27,480 66,669
Operating lease liability 0 (15,511)
Accrued liabilities 122,580 (284,097)
Deferred revenue (489,711) 143,785
Net cash provided by operating activities 1,538,447 1,868,900
Cash flows from investing activities:    
Purchase of property and equipment (11,750) 0
Sale (purchase) of marketable securities (8,609) 34,086
Net cash provided by (used in) investing activities (20,359) 34,086
Cash flows from financing activities:    
Common Stock buyback/retirement (149,985) 0
Proceeds from employee stock plan 63,479 59,852
Dividends paid (402,917) (422,954)
Payments on notes payable and capital leases (52,669) (153,545)
Net cash used in financing activities (1,292,087) (1,266,642)
Net increase (decrease) in cash and cash equivalents 226,001 636,344
Cash and cash equivalents at beginning of period 28,568,805 25,153,862
Cash and cash equivalents at end of period 28,794,806 25,790,206
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 536,561 312,098
Cash paid for interest 3,984 2,005
Cash paid for operating leases $ 0 $ 18,686
Common stock to pay accrued liabilities (in shares) 99,999 69,985
Dividends accrued on preferred stock $ 58,817 $ 107,882
Right-of-use asset 0 289,734
Series B Preferred Stock [Member]    
Cash flows from financing activities:    
Redemption of Series B Preferred $ (749,995) $ (749,995)