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Segment Reporting (Tables)
 6 Months Ended
Jul. 31, 2014
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information Profit Loss And Revenue Percentage [Table Text Block] The following table summarizes segment and other results and assets (amounts in thousands):

    Three Months Ended July 31,     Six Months Ended July 31,  
    2014     2013     2014     2013  
Net sales and revenue:                                
Alternative energy   $ 150,133     $ 175,290     $ 305,960     $ 353,614  
Real estate     98       99       207       199  
Total net sales and revenues   $ 150,231     $ 175,389     $ 306,167     $ 353,813  
                                 
Segment gross profit (loss):                                
Alternative energy   $ 38,820     $ 10,890     $ 75,434     $ 19,916  
Real estate     (2 )     (12 )     9       (40 )
Total gross profit   $ 38,818     $ 10,878     $ 75,443     $ 19,876  
                                 
Segment profit (loss):                                
Alternative energy   $ 41,509     $ 11,114     $ 80,385     $ 17,740  
Real estate     (28 )     (74 )     (44 )     (163 )
Corporate expense, net     (761 )     (722 )     (1,514 )     (1,413 )
Income from continuing operations before income taxes and noncontrolling interests   $ 40,720     $ 10,318     $ 78,827     $ 16,164  
Schedule of Segment Reporting Information Assets [Table Text Block]
    July
31, 2014 		    January
31, 2014 		 
Assets:                
Alternative energy   $ 413,883     $ 356,589  
Real estate     4,141       4,722  
Corporate     51,496       66,557  
Total assets   $ 469,520     $ 427,868