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Balance Sheets - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Current assets:    
Accounts receivable $ 104,741 $ 126,423
Prepaid expense and other assets 212,279 28,695
Total current assets 9,388,882 8,307,928
Property and equipment, net 9,095,403 9,079,612
Deferred tax asset 329,121 300,050
Total assets 18,813,406 17,687,590
Current liabilities:    
Trade payables and accrued expenses 159,159 37,626
Income tax payable 151,404 0
Unearned revenue 184,785 229,550
Total current liabilities 495,348 267,176
Total liabilities 495,348 267,176
Stockholders' equity:    
Common stock, 3,000,000 shares authorized, no par value, 2,014,283 and 1,991,337 shares issued and outstanding, respectively, as of December 31, 2023, and 1,988,701 and 1,974,427 shares issued and outstanding, respectively, as of December 31, 2022 59,335 59,335
Additional paid in capital 3,150,376 2,308,537
Treasury stock, 22,946 and 14,274 shares, at cost, respectively, as of December 31, 2023 and 2022 (263,748) (176,592)
Retained earnings 15,372,095 15,229,134
Total stockholders' equity 18,318,058 17,420,414
Total liabilities and stockholders' equity 18,813,406 17,687,590
Cash and Cash Equivalents Excluding Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents 7,546,689 7,148,207
Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents $ 1,525,173 $ 1,004,603