Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Accrued accounts receivable	$ 59,756	$ 78,119
Prepaid expense and other assets	247,177	171,202
Total current assets	9,941,535	9,579,388
Property and equipment, net	8,865,506	9,036,105
Deferred tax asset	79,720	231,744
Total assets	18,886,761	18,847,237
Current liabilities:
Trade payables and accrued expenses	16,568	52,420
Unearned revenue	158,138	211,763
Total current liabilities	174,706	264,183
Total liabilities	174,706	264,183
Stockholders' equity:
Common stock, 3,000,000 shares authorized, no par value, 2,102,595 and 2,052,237 shares issued and outstanding, respectively, as of June 30, 2025 and 2,066,044 and 2,027,032 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, 50,358 and 39,012 shares, at cost, as of June 30, 2025 and December 31, 2024	(620,216)	(472,602)
Retained earnings	15,898,934	15,622,319
Total stockholders' equity	18,712,055	18,583,054
Total liabilities and stockholders' equity	18,886,761	18,847,237
Cash and Cash Equivalents Excluding Certificates of Deposit [Member]
Current assets:
Cash and cash equivalents	7,468,514	3,421,576
Certificates of deposit	7,468,514	3,421,576
Certificates of Deposit [Member]
Current assets:
Cash and cash equivalents	2,166,088	5,908,491
Certificates of deposit	$ 2,166,088	$ 5,908,491