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Balance Sheets (Current Period Unaudited) - USD ($)
Sep. 30, 2024
Dec. 31, 2023
Current assets:    
Accrued accounts receivable $ 84,799 $ 104,741
Prepaid expense and other assets 188,043 212,279
Total current assets 9,460,950 9,388,882
Property and equipment, net 9,092,142 9,095,403
Deferred tax asset 171,937 329,121
Total assets 18,725,029 18,813,406
Current liabilities:    
Trade payables and accrued expenses 51,599 159,159
Income tax payable 0 151,404
Unearned revenue 122,535 184,785
Total current liabilities 174,134 495,348
Total liabilities 174,134 495,348
Stockholders' equity:    
Common stock, 3,000,000 shares authorized, no par value, 2,066,044 and 2,027,032 shares issued and outstanding, respectively, as of September 30, 2024 and 2,014,283 and 1,991,337 shares issued and outstanding, respectively, as of December 31, 2023 59,335 59,335
Additional paid in capital 3,374,002 3,150,376
Treasury stock, 39,012 and 22,946 shares, at cost, as of September 30, 2024 and December 31, 2023, respectively (472,602) (263,748)
Retained earnings 15,590,160 15,372,095
Total stockholders' equity 18,550,895 18,318,058
Total liabilities and stockholders' equity 18,725,029 18,813,406
Cash and Cash Equivalents Excluding Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents 3,318,637 7,546,689
Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents $ 5,869,471 $ 1,525,173