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Note 6 - Income Taxes - Reconciliation of Computed Income Tax (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Computed Federal Tax Provision $ 567,330 $ 35,035
Increase (Decrease) in Tax From:    
Allowable Depletion in Excess of Basis (192,979) (51,533)
Dividend Received Deduction (305) (618)
State Income Tax Provision/(Benefit) 784 (167)
Federal Income Tax Rate Change (577,797)
Other 13,050 12,498
Total Provision/(Benefit) $ 387,880 $ (582,582)
Effective Tax Rate 14.00% 5.00%