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Balance Sheets (Current Period Unaudited) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Current assets:    
Accrued accounts receivable $ 44,401 $ 78,119
Prepaid expense and other assets 177,508 171,202
Assets held for sale 4,504,354 0
Total current assets 14,744,240 9,579,388
Property and equipment, net 4,305,398 9,036,105
Deferred tax asset 109,819 231,744
Total assets 19,159,457 18,847,237
Current liabilities:    
Trade payables and accrued expenses 111,639 52,420
Unearned revenue 169,459 211,763
Total current liabilities 281,098 264,183
Total liabilities 281,098 264,183
Stockholders' equity:    
Common stock, 3,000,000 shares authorized, no par value, 2,102,595 and 2,053,129 shares issued and outstanding, respectively, as of September 30, 2025 and 2,066,044 and 2,072,032 shares issued and outstanding, respectively, as of December 31, 2024 59,335 59,335
Additional paid in capital 3,374,002 3,374,002
Treasury stock, 49,466 and 39,012 shares, at cost, as of September 30, 2025 and December 31, 2024, respectively (620,216) (472,602)
Retained earnings 16,065,238 15,622,319
Total stockholders' equity 18,878,359 18,583,054
Total liabilities and stockholders' equity 19,159,457 18,847,237
Cash and Cash Equivalents Excluding Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents 7,851,889 3,421,576
Certificates of Deposit [Member]    
Current assets:    
Cash and cash equivalents $ 2,166,088 $ 5,908,491