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Manufacturing Segment Data (Details 1) (USD $)
 3 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Jan. 31, 2013
Net Sales:      
Net sales $ 21,736,990 $ 23,980,711  
External Sales:      
Revenue from External Customers 21,740,000 23,980,000  
Intersegment Sales:      
Intersegment Revenue 8,280,000 5,490,000  
Operating Profit (Loss):      
Operating Profit (Loss) (236,631) 24,937  
Depreciation and Amortization Expense:      
Depreciation and Amortization Expense 434,436 374,889  
Interest Expense:      
Interest Expense 273,435 236,392  
Income Tax Expense (Benefits):      
Income Tax Expense (benefits) 178,693 (346,402)  
Total Assets (at Balance Sheet Date):      
Total assets 83,581,939 101,500,000 83,318,003
Long-Lived Assets (at Balance Sheet Date)      
Long-Lived Assets 13,970,000 13,820,000  
Usa [Member]
      
Net Sales:      
Net sales 12,830,000 10,590,000  
External Sales:      
Revenue from External Customers 11,860,000 9,770,000  
Intersegment Sales:      
Intersegment Revenue 970,000 820,000  
Operating Profit (Loss):      
Operating Profit (Loss) 290,000 (1,470,000)  
Depreciation and Amortization Expense:      
Depreciation and Amortization Expense 190,000 140,000  
Interest Expense:      
Interest Expense 130,000 100,000  
Income Tax Expense (Benefits):      
Income Tax Expense (benefits) 60,000 (500,000)  
Total Assets (at Balance Sheet Date):      
Total assets 24,800,000 31,640,000  
Long-Lived Assets (at Balance Sheet Date)      
Long-Lived Assets 3,400,000 3,860,000  
Other foreign [Member]
      
Net Sales:      
Net sales 5,860,000 5,020,000  
External Sales:      
Revenue from External Customers 5,310,000 4,960,000  
Intersegment Sales:      
Intersegment Revenue 550,000 60,000  
Operating Profit (Loss):      
Operating Profit (Loss) 180,000 280,000  
Depreciation and Amortization Expense:      
Depreciation and Amortization Expense 50,000 50,000  
Interest Expense:      
Interest Expense 40,000 40,000  
Income Tax Expense (Benefits):      
Income Tax Expense (benefits) 70,000 50,000  
Total Assets (at Balance Sheet Date):      
Total assets 14,160,000 12,600,000  
Long-Lived Assets (at Balance Sheet Date)      
Long-Lived Assets 2,360,000 2,470,000  
Mexico [Member]
      
Net Sales:      
Net sales 620,000 510,000  
External Sales:      
Revenue from External Customers 180,000 100,000  
Intersegment Sales:      
Intersegment Revenue 440,000 410,000  
Operating Profit (Loss):      
Operating Profit (Loss) (100,000) (50,000)  
Depreciation and Amortization Expense:      
Depreciation and Amortization Expense 10,000 0  
Interest Expense:      
Interest Expense 10,000 10,000  
Income Tax Expense (Benefits):      
Income Tax Expense (benefits) 0 10,000  
Total Assets (at Balance Sheet Date):      
Total assets 3,470,000 3,460,000  
Long-Lived Assets (at Balance Sheet Date)      
Long-Lived Assets 2,170,000 2,220,000  
China [Member]
      
Net Sales:      
Net sales 8,930,000 8,160,000  
External Sales:      
Revenue from External Customers 2,610,000 3,960,000  
Intersegment Sales:      
Intersegment Revenue 6,320,000 4,200,000  
Operating Profit (Loss):      
Operating Profit (Loss) 390,000 830,000  
Depreciation and Amortization Expense:      
Depreciation and Amortization Expense 70,000 90,000  
Interest Expense:      
Interest Expense 0 0  
Income Tax Expense (Benefits):      
Income Tax Expense (benefits) 150,000 150,000  
Total Assets (at Balance Sheet Date):      
Total assets 27,660,000 24,030,000  
Long-Lived Assets (at Balance Sheet Date)      
Long-Lived Assets 3,420,000 2,400,000  
Brazil [Member]
      
Net Sales:      
Net sales 1,780,000 5,190,000  
External Sales:      
Revenue from External Customers 1,780,000 5,190,000  
Intersegment Sales:      
Intersegment Revenue 0 0  
Operating Profit (Loss):      
Operating Profit (Loss) (930,000) 380,000  
Depreciation and Amortization Expense:      
Depreciation and Amortization Expense 110,000 100,000  
Interest Expense:      
Interest Expense 250,000 240,000  
Income Tax Expense (Benefits):      
Income Tax Expense (benefits) 0 (90,000)  
Total Assets (at Balance Sheet Date):      
Total assets 12,750,000 27,770,000  
Long-Lived Assets (at Balance Sheet Date)      
Long-Lived Assets 2,620,000 2,870,000  
India [Member]
      
Total Assets (at Balance Sheet Date):      
Total assets 740,000 2,000,000  
Long-Lived Assets (at Balance Sheet Date)      
Long-Lived Assets 0 0  
Intersegment Elimination [Member]
      
Net Sales:      
Net sales (8,280,000) (5,490,000)  
Intersegment Sales:      
Intersegment Revenue 8,280,000 5,490,000  
Operating Profit (Loss):      
Operating Profit (Loss) (70,000) 50,000  
Interest Expense:      
Interest Expense (150,000) (150,000)  
Income Tax Expense (Benefits):      
Income Tax Expense (benefits) $ (100,000) $ 30,000