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Property, plant and equipment
9 Months Ended
Mar. 31, 2016
Property, plant and equipment [Text Block]

Note 6 – Property, plant and equipment

Property, plant and equipment consist of the following:

    March 31,     June 30,  
    2016     2015  
Machinery and equipment $ 2,205,667   $ 2,363,324  
Transportation equipment   745,867     1,030,710  
Leased equipment   10,691,352     11,287,442  
Office equipment   1,205,561     1,305,992  
Buildings and improvements   324,431     393,205  
Total   15,172,878     16,380,673  
Less: Accumulated depreciation   (7,256,781 )   (6,224,825 )
Plant and equipment, net $ 7,916,097   $ 10,155,848  

Depreciation expense for each of the three months ended March 31, 2016 and 2015 amounted to approximately $0.5 million. Depreciation expense for the nine months ended March 31, 2016 and 2015 amounted to approximately $1.5 million and $1.6 million, respectively. Depreciation expense for the leased equipment for each of the three months ended March 31, 2016 and 2015 was $0.4 million. Depreciation expense for the leased equipment for each of the nine months ended March 31, 2016 and 2015 amounted to approximately $1.1 million. Accumulated depreciation for the leased equipment as of March 31, 2016 and June 30, 2015 was $4.3 million and $3.3 million, respectively. There was no impairment charge for each of the three and nine months ended March 31, 2016 and 2015.