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Balance Sheets (Current Period Unaudited) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Current assets:    
Accrued accounts receivable $ 95,085 $ 104,741
Prepaid expense and other assets 136,255 212,279
Total current assets 8,982,131 9,388,882
Property and equipment, net 9,094,317 9,095,403
Deferred tax asset 314,180 329,121
Total assets 18,390,628 18,813,406
Current liabilities:    
Trade payables and accrued expenses 63,744 159,159
Income tax payable 151,404 151,404
Unearned revenue 153,246 184,785
Total current liabilities 368,394 495,348
Total liabilities 368,394 495,348
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 March 31, 2024 and December 31, 2023 59,335 59,335
Additional paid in capital 3,255,881 3,150,376
Treasury stock, 22,496 shares, at cost, as of March 31, 2024 and December 31, 2023 (263,748) (263,748)
Retained earnings 14,970,766 15,372,095
Total stockholders' equity 18,022,234 18,318,058
Total liabilities and stockholders' equity 18,390,628 18,813,406
Cash and Cash Equivalents Excluding Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents 7,243,336 7,546,689
Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents $ 1,507,455 $ 1,525,173