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Note 3 - Income Taxes - Income Tax Reconciliation (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Tax at statutory rates $ 75,586 $ 229,094
Tax effect of the following:    
Statutory depletion (24,936) (39,383)
Section 1033 deferred gain (58,090)
Section 179 deduction (5,229)
State income tax 808 10,481
Other (744) 335
Income tax on income $ 45,485 $ 142,437