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Balance Sheets - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Current assets:    
Equity investment in mutual funds $ 0 $ 502,832
Accounts receivable 126,423 50,739
Prepaid expense and other assets 28,695 35,405
Total current assets 8,307,928 7,998,849
Property and equipment, net 9,079,612 9,056,238
Deferred tax asset 300,050 0
Total assets 17,687,590 17,055,087
Current liabilities:    
Trade payables and accrued expenses 37,626 111,123
Unearned revenue 229,550 150,113
Total current liabilities 267,176 261,236
Deferred income tax payable 0 187,664
Total liabilities 267,176 448,900
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 December 31, 2022, and 1,942,495 shares issued and outstanding as of December 31, 2021 59,335 59,335
Additional paid in capital 2,308,537 0
Treasury stock, 10,166 shares, at cost 176,592 (0)
Retained earnings 15,229,134 16,546,852
Total stockholders' equity 17,420,414 16,606,187
Total liabilities and stockholders' equity 17,687,590 17,055,087
Cash and Cash Equivalents Excluding Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents 7,148,207 7,409,873
Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents $ 1,004,603 $ 0