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Capital lease obligations (Tables)
9 Months Ended
Mar. 31, 2016
Schedule of Capital lease obligations [Table Text Block]
    March 31,     June 30,  
    2016     2015  
Lease obligations for concrete pump trucks, paid off in February 2016 $   -   $ 1,152,950  
Lease obligations for concrete mixer trucks, paid off in September 2015   -     95,420  
Lease obligations for concrete mixer, paid off in February 2016   -     266,757  
Total            
    -     1,515,127  
Less: Deferred interest   -     (25,743 )
    -     1,489,384  
Less: Capital lease obligations - current   -     (1,489,384 )
Capital lease obligations - non current $ -   $ -