Note 4 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Property and equipment - gross	$ 67,747,408	$ 66,844,748
Accumulated depreciation	(35,476,894)	(32,226,787)
Property and equipment – net	32,270,514	34,617,961
Vehicles [Member]
Property and equipment - gross	54,855,287	54,353,632
Water Transfer Equipment [Member]
Property and equipment - gross	4,906,505	4,520,155
Property, Plant and Equipment, Other Types [Member]
Property and equipment - gross	2,913,112	2,898,457
Building and Building Improvements [Member]
Property and equipment - gross	3,896,865	3,896,865
Land [Member]
Property and equipment - gross	784,636	784,636
Disposal Wells [Member]
Property and equipment - gross	$ 391,003	$ 391,003

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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