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Note 12 - Derivatives and Fair Value Disclosures - Valuation of Assets Measured at Fair Value on a Non-recurring Basis (Details) - USD ($)
6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Impairment Loss     $ (2,156,002) $ (5,735,086)  
Impairment Loss     (4,305,271)    
Net Book Value, Impairment loss     $ (6,461,273) (5,735,086) $ (8,238,987)
Fair Value, Measurements, Nonrecurring [Member]          
Long-lived Assets Held-for-use, Fair Value Disclosure $ 6,000,000 $ 8,000,000   26,500,000  
Impairment Loss (897,965) (1,258,037)   (5,735,086)  
Fair value of assets 11,800,000 14,250,000   26,500,000  
Assets Held-for-sale, Long Lived, Fair Value Disclosure 5,800,000 6,250,000      
Impairment Loss (2,327,927) (1,977,344)      
Total 11,800,000 14,250,000   26,500,000  
Net Book Value, Impairment loss (3,225,892) (3,235,381)      
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Long-lived Assets Held-for-use, Fair Value Disclosure    
Fair value of assets    
Assets Held-for-sale, Long Lived, Fair Value Disclosure      
Total    
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Long-lived Assets Held-for-use, Fair Value Disclosure 6,000,000 8,000,000   26,500,000  
Fair value of assets 11,800,000 14,250,000   26,500,000  
Assets Held-for-sale, Long Lived, Fair Value Disclosure 5,800,000 6,250,000      
Total 11,800,000 14,250,000   26,500,000  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Long-lived Assets Held-for-use, Fair Value Disclosure    
Fair value of assets    
Assets Held-for-sale, Long Lived, Fair Value Disclosure      
Total