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Balance Sheets (Current Period Unaudited) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
Current assets:    
Accrued accounts receivable $ 67,359 $ 78,119
Prepaid expense and other assets 235,161 171,202
Total current assets 9,751,251 9,579,388
Property and equipment, net 9,035,235 9,036,105
Deferred tax asset 171,937 231,744
Total assets 18,958,423 18,847,237
Current liabilities:    
Trade payables and accrued expenses 73,742 52,420
Unearned revenue 186,054 211,763
Total current liabilities 259,796 264,183
Total liabilities 259,796 264,183
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 March 31, 2025 and December 31, 2024 59,335 59,335
Additional paid in capital 3,374,002 3,374,002
Treasury stock, 39,012 shares, at cost, as of March 31, 2025 and December 31, 2024 (472,602) (472,602)
Retained earnings 15,737,892 15,622,319
Total stockholders' equity 18,698,627 18,583,054
Total liabilities and stockholders' equity 18,958,423 18,847,237
Cash and Cash Equivalents Excluding Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents 3,712,483 3,421,576
Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents $ 5,736,248 $ 5,908,491