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Balance Sheets (Current Period Unaudited) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Current assets:    
Accounts receivable $ 66,715 $ 126,423
Prepaid expense and other assets 145,378 28,695
Total current assets 8,746,578 8,307,928
Property and equipment, net 9,096,613 9,079,612
Deferred tax asset 332,942 300,050
Total assets 18,176,133 17,687,590
Current liabilities:    
Trade payables and accrued expenses 23,238 37,626
Unearned revenue 94,826 229,550
Total current liabilities 118,064 267,176
Total liabilities 118,064 267,176
Stockholders' equity:    
Common stock, 3,000,000 shares authorized, no par value, 1,988,701 and 1,974,427 shares issued and outstanding, respectively, as of June 30, 2023, and December 31, 2022 59,335 59,335
Additional paid in capital 3,044,871 2,308,537
Treasury stock, 14,274 shares, at cost (176,592) (176,592)
Retained earnings 15,130,455 15,229,134
Total stockholders' equity 18,058,069 17,420,414
Total liabilities and stockholders' equity 18,176,133 17,687,590
Cash and Cash Equivalents Excluding Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents 7,026,443 7,148,207
Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents $ 1,508,042 $ 1,004,603