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Note 6 - Income Taxes - Reconciliation of Computed Income Tax (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Computed Federal Tax Provision/(Benefit) $ (102,866) $ 567,330
Increase (Decrease) in Tax From:    
Allowable Depletion in Excess of Basis (60,224) (192,979)
Dividend Received Deduction (4,443) (305)
State Income Tax Provision/(Benefit) (1,633) 784
Other (53,909) 13,050
Total Provision/(Benefit) $ (223,075) $ 387,880
Effective Tax Rate 46.00% 14.00%