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Manufacturing Segment Data (Details 1) (USD $)
 3 Months Ended 9 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Jan. 31, 2012
Net Sales from Continuing Operations:          
Net sales from continuing operations $ 24,238,573 $ 24,744,033 $ 71,718,608 $ 76,162,356  
External Sales from Continuing Operations:          
Revenue from External Customers 24,240,000 24,740,000 71,720,000 76,160,000  
Intersegment Sales from Continuing Operations:          
Segment Reporting Information, Intersegment Revenue 6,970,000 4,650,000 19,730,000 16,600,000  
Operating Profit (Loss) from Continuing Operations:          
Operating profit from continuing operations 267,398 572,681 444,309 2,974,242  
Depreciation and Amortization Expense from Continuing Operations:          
Depreciation and amortization 380,000 380,000 1,128,784 1,207,135  
Interest Expense from Continuing Operations:          
Interest expense 270,273 161,914 766,119 425,471  
Income Tax Expense (Benefits) from Continuing Operations:          
Provision (benefit) for income taxes (295,340) (90,998) (669,024) 411,650  
Total Assets (at Balance Sheet Date):          
Total assets 100,981,042 105,390,000 100,981,042 105,390,000 102,404,854
Long-lived Assets (at Balance Sheet Date)          
Long-Lived Assets 14,140,000 13,590,000 14,140,000 13,590,000  
USA [Member]
          
Net Sales from Continuing Operations:          
Net sales from continuing operations 10,720,000 13,610,000 31,300,000 44,360,000  
External Sales from Continuing Operations:          
Revenue from External Customers 9,830,000 12,740,000 28,690,000 41,000,000  
Intersegment Sales from Continuing Operations:          
Segment Reporting Information, Intersegment Revenue 890,000 870,000 2,610,000 3,360,000  
Operating Profit (Loss) from Continuing Operations:          
Operating profit from continuing operations (850,000) (610,000) 3,110,000 (460,000)  
Depreciation and Amortization Expense from Continuing Operations:          
Depreciation and amortization 150,000 160,000 440,000 510,000  
Interest Expense from Continuing Operations:          
Interest expense 170,000 110,000 410,000 270,000  
Income Tax Expense (Benefits) from Continuing Operations:          
Provision (benefit) for income taxes (320,000) (270,000) (1,060,000) (290,000)  
Total Assets (at Balance Sheet Date):          
Total assets 29,640,000 37,430,000 29,640,000 37,430,000  
Long-lived Assets (at Balance Sheet Date)          
Long-Lived Assets 5,020,000 5,330,000 5,020,000 5,330,000  
Other Countries [Member]
          
Net Sales from Continuing Operations:          
Net sales from continuing operations 6,670,000 4,370,000 18,180,000 14,090,000  
External Sales from Continuing Operations:          
Revenue from External Customers 5,920,000 3,900,000 16,410,000 12,540,000  
Intersegment Sales from Continuing Operations:          
Segment Reporting Information, Intersegment Revenue 750,000 470,000 1,770,000 1,550,000  
Operating Profit (Loss) from Continuing Operations:          
Operating profit from continuing operations 430,000 90,000 870,000 490,000  
Depreciation and Amortization Expense from Continuing Operations:          
Depreciation and amortization 50,000 40,000 160,000 110,000  
Interest Expense from Continuing Operations:          
Interest expense 50,000 60,000 150,000 180,000  
Income Tax Expense (Benefits) from Continuing Operations:          
Provision (benefit) for income taxes 20,000 450,000 140,000 700,000  
Total Assets (at Balance Sheet Date):          
Total assets 17,690,000 14,750,000 17,690,000 14,750,000  
Long-lived Assets (at Balance Sheet Date)          
Long-Lived Assets 1,700,000 30,000 1,700,000 30,000  
China [Member]
          
Net Sales from Continuing Operations:          
Net sales from continuing operations 9,530,000 6,540,000 27,800,000 21,350,000  
External Sales from Continuing Operations:          
Revenue from External Customers 4,200,000 3,230,000 12,450,000 9,660,000  
Intersegment Sales from Continuing Operations:          
Segment Reporting Information, Intersegment Revenue 5,330,000 3,310,000 15,350,000 11,690,000  
Operating Profit (Loss) from Continuing Operations:          
Operating profit from continuing operations 1,010,000 460,000 2,160,000 1,940,000  
Depreciation and Amortization Expense from Continuing Operations:          
Depreciation and amortization 90,000 80,000 260,000 240,000  
Interest Expense from Continuing Operations:          
Interest expense 0 0 0 0  
Income Tax Expense (Benefits) from Continuing Operations:          
Provision (benefit) for income taxes 30,000 180,000 400,000 560,000  
Total Assets (at Balance Sheet Date):          
Total assets 26,490,000 22,320,000 26,490,000 22,320,000  
Long-lived Assets (at Balance Sheet Date)          
Long-Lived Assets 3,020,000 2,490,000 3,020,000 2,490,000  
Brazil [Member]
          
Net Sales from Continuing Operations:          
Net sales from continuing operations 4,290,000 4,870,000 14,170,000 12,960,000  
External Sales from Continuing Operations:          
Revenue from External Customers 4,290,000 4,870,000 14,170,000 12,960,000  
Intersegment Sales from Continuing Operations:          
Segment Reporting Information, Intersegment Revenue 0 0 0 0  
Operating Profit (Loss) from Continuing Operations:          
Operating profit from continuing operations (370,000) 460,000 (250,000) 270,000  
Depreciation and Amortization Expense from Continuing Operations:          
Depreciation and amortization 90,000 100,000 270,000 350,000  
Interest Expense from Continuing Operations:          
Interest expense 240,000 80,000 760,000 180,000  
Income Tax Expense (Benefits) from Continuing Operations:          
Provision (benefit) for income taxes (140,000) (60,000) (430,000) (200,000)  
Total Assets (at Balance Sheet Date):          
Total assets 24,490,000 27,160,000 24,490,000 27,160,000  
Long-lived Assets (at Balance Sheet Date)          
Long-Lived Assets 2,880,000 2,490,000 2,880,000 2,490,000  
India [Member]
          
Total Assets (at Balance Sheet Date):          
Total assets 2,670,000 3,730,000 2,670,000 3,730,000  
Long-lived Assets (at Balance Sheet Date)          
Long-Lived Assets 1,520,000 3,250,000 1,520,000 3,250,000  
Geographical Intersegment, Eliminations [Member]
          
Net Sales from Continuing Operations:          
Net sales from continuing operations (6,970,000) (4,650,000) (19,730,000) (16,600,000)  
Operating Profit (Loss) from Continuing Operations:          
Operating profit from continuing operations 50,000 170,000 770,000 730,000  
Interest Expense from Continuing Operations:          
Interest expense (190,000) (90,000) (550,000) (210,000)  
Income Tax Expense (Benefits) from Continuing Operations:          
Provision (benefit) for income taxes $ 110,000 $ (390,000) $ 280,000 $ (360,000)