Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Temporary Differences (Detail)

v2.4.0.6
Income Taxes - Summary of Temporary Differences (Detail) (USD $)
Nov. 30, 2012
Nov. 30, 2011
Deferred Tax Liability Not Recognized [Line Items]    
Deferred Tax $ 1,002,811 $ 1,556,610
Short-Term Asset 1,242,484 1,738,949
Long-Term (Liability) (239,673) (182,339)
Depreciation [Member]
    
Deferred Tax Liability Not Recognized [Line Items]    
Amount (1,028,273) (451,334)
Deferred Tax (379,470) (182,339)
Short-Term Asset      
Long-Term (Liability) (379,470) (182,339)
Unrealized gain on investments [Member]
    
Deferred Tax Liability Not Recognized [Line Items]    
Amount (55,863)  
Deferred Tax (20,616)  
Short-Term Asset (20,616)  
Long-Term (Liability)     
Reserve for bad debts [Member]
    
Deferred Tax Liability Not Recognized [Line Items]    
Amount 26,340 53,191
Deferred Tax 9,721 21,489
Short-Term Asset 9,721 21,489
Long-Term (Liability)      
Reserve for returns [Member]
    
Deferred Tax Liability Not Recognized [Line Items]    
Amount 1,772,405 2,014,303
Deferred Tax 654,083 813,778
Short-Term Asset 654,083 813,778
Long-Term (Liability)      
Reserve for obsolete inventories [Member]
    
Deferred Tax Liability Not Recognized [Line Items]    
Amount 671,609 892,226
Deferred Tax 247,849 360,459
Short-Term Asset 247,849 360,459
Long-Term (Liability)      
Vacation accrual [Member]
    
Deferred Tax Liability Not Recognized [Line Items]    
Amount 323,470 348,558
Deferred Tax 119,372 140,817
Short-Term Asset 119,372 140,817
Long-Term (Liability)      
Charitable Contributions [Member]
    
Deferred Tax Liability Not Recognized [Line Items]    
Amount 722,555 564,583
Deferred Tax 266,649 228,093
Short-Term Asset 126,852 228,093
Long-Term (Liability) 139,797   
Section 263A costs [Member]
    
Deferred Tax Liability Not Recognized [Line Items]    
Amount 285,129 239,404
Deferred Tax 105,223 96,719
Short-Term Asset 105,223 96,719
Long-Term (Liability)      
Unrealized loss on investments [Member]
    
Deferred Tax Liability Not Recognized [Line Items]    
Amount   192,064
Deferred Tax   77,594
Short-Term Asset   77,594
Long-Term (Liability)