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Note 9 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income tax (benefit)/expense at federal statutory rate [21%-2018; 34%-2017]     $ (79,430) $ 1,361,450
State taxes     3,500 7,643
Change in other accruals     4,769 101
Difference between tax and book depreciation     39,827 91,033
Stock-based compensation     140,052 (58,334)
Domestic production activities deduction     (137,178)
Net operating loss carryforward     (6,800)
Income tax expense $ (139,052) $ 573,783 $ 108,718 $ 1,257,915