Note 12 - Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Loss carryforwards U.S. - Federal/States	$ 13,499,628
Asset retirement obligations	3,178,064
Equity-based compensation	802,843
Total deferred tax assets	17,480,535
Less valuation allowance	(4,464,141)
Deferred tax assets, net	13,016,394
Deferred tax liabilities:
Property, plant & equipment	(13,016,394)
Net deferred tax assets, net of valuation allowance	$ 0	$ 0