|
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
|
12 Months Ended |
|
Jan. 31, 2013
|
Jan. 31, 2012
|
Jan. 31, 2011
|
| Goodwill and Intangible Asset Impairment [Abstract] |
|
|
|
| Number of reportable segments |
3 |
|
|
| Goodwill [Line Items] |
|
|
|
| Goodwill beginning of period |
$ 20,798,913 |
|
|
| Goodwill acquired during the period |
0 |
|
|
| Goodwill end of period |
20,798,913 |
20,798,913 |
|
| Amortized intangible assets [Abstract] |
|
|
|
| Gross Carrying Amount |
1,552,417 |
1,523,044 |
|
| Accumulated Amortization |
(816,564) |
(713,971) |
|
| Indefinite-lived Intangible Assets [Line Items] |
|
|
|
| Amortization Expense |
102,593 |
107,851 |
52,017 |
| Estimated Amortization Expense [Abstract] |
|
|
|
| January 31, 2014 |
82,117 |
|
|
| January 31, 2015 |
81,671 |
|
|
| January 31, 2016 |
80,724 |
|
|
| January 31, 2017 |
79,057 |
|
|
| January 31, 2018 |
75,724 |
|
|
| Thereafter |
336,560 |
|
|
| Total |
735,853 |
|
|
| Asset Available for Sale |
|
|
|
| Land available-for-sale Heerenveen, The Netherlands |
567,459 |
546,771 |
|
| Advertising [Abstract] |
|
|
|
| Advertising costs |
1,354,995 |
1,258,220 |
988,217 |
| Research and Development [Abstract] |
|
|
|
| Research and development costs |
2,155,025 |
2,512,923 |
2,242,052 |
| Dividends payable [Abstract] |
|
|
|
| Quarterly dividend per share (in dollars per share) |
$ 0.0725 |
|
|
| Dividend payable date |
Mar. 15,
2013 |
|
|
| Dividends payable record date |
Mar.
01,
2013 |
|
|
| Dividends payable |
1,068,862 |
|
|
| Cash paid during the year for [Abstract] |
|
|
|
| Interest |
167,619 |
192,971 |
210,497 |
| Income taxes |
3,258,500 |
2,394,238 |
2,096,789 |
|
Trademarks [Member]
|
|
|
|
| Indefinite-lived Intangible Assets [Line Items] |
|
|
|
| Unamortized intangible assets |
11,963 |
11,963 |
|
|
Patents [Member]
|
|
|
|
| Amortized intangible assets [Abstract] |
|
|
|
| Gross Carrying Amount |
791,194 |
761,821 |
|
| Accumulated Amortization |
(197,855) |
(131,665) |
|
|
Customer Lists [Member]
|
|
|
|
| Amortized intangible assets [Abstract] |
|
|
|
| Gross Carrying Amount |
384,000 |
384,000 |
|
| Accumulated Amortization |
(288,167) |
(275,667) |
|
| Estimated useful life |
10 years |
|
|
|
Intellectual Property [Member]
|
|
|
|
| Amortized intangible assets [Abstract] |
|
|
|
| Gross Carrying Amount |
195,886 |
195,886 |
|
| Accumulated Amortization |
(195,886) |
(195,886) |
|
| Estimated useful life |
10 years |
|
|
|
Other [Member]
|
|
|
|
| Amortized intangible assets [Abstract] |
|
|
|
| Gross Carrying Amount |
181,337 |
181,337 |
|
| Accumulated Amortization |
(134,656) |
(110,753) |
|
|
Product Recovery/Pollution Control Technologies [Member]
|
|
|
|
| Goodwill [Line Items] |
|
|
|
| Goodwill beginning of period |
15,706,667 |
|
|
| Goodwill acquired during the period |
0 |
|
|
| Goodwill end of period |
15,706,667 |
|
|
|
Fluid Handling Technologies [Member]
|
|
|
|
| Goodwill [Line Items] |
|
|
|
| Goodwill beginning of period |
11,542 |
|
|
| Goodwill acquired during the period |
0 |
|
|
| Goodwill end of period |
11,542 |
|
|
|
Mefiag Filtration Technologies [Member]
|
|
|
|
| Goodwill [Line Items] |
|
|
|
| Goodwill beginning of period |
1,732,482 |
|
|
| Goodwill acquired during the period |
0 |
|
|
| Goodwill end of period |
1,732,482 |
|
|
|
Filtration/Purification Technologies [Member]
|
|
|
|
| Goodwill [Line Items] |
|
|
|
| Goodwill beginning of period |
3,348,222 |
|
|
| Goodwill acquired during the period |
0 |
|
|
| Goodwill end of period |
$ 3,348,222 |
|
|
|
Minimum [Member] | Patents [Member]
|
|
|
|
| Amortized intangible assets [Abstract] |
|
|
|
| Estimated useful life |
6 years |
|
|
|
Minimum [Member] | Other [Member]
|
|
|
|
| Amortized intangible assets [Abstract] |
|
|
|
| Estimated useful life |
2 years |
|
|
|
Maximum [Member] | Patents [Member]
|
|
|
|
| Amortized intangible assets [Abstract] |
|
|
|
| Estimated useful life |
20 years |
|
|
|
Maximum [Member] | Other [Member]
|
|
|
|
| Amortized intangible assets [Abstract] |
|
|
|
| Estimated useful life |
20 years |
|
|
|
Building and improvements [Member] | Minimum [Member]
|
|
|
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| Property, Plant and Equipment [Line Items] |
|
|
|
| Useful life |
10 years |
|
|
|
Building and improvements [Member] | Maximum [Member]
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
| Useful life |
39 years |
|
|
|
Machinery and equipment [Member] | Minimum [Member]
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
| Useful life |
5 years |
|
|
|
Machinery and equipment [Member] | Maximum [Member]
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
| Useful life |
10 years |
|
|
|
Furniture and fixtures [Member] | Minimum [Member]
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
| Useful life |
5 years |
|
|
|
Furniture and fixtures [Member] | Maximum [Member]
|
|
|
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| Property, Plant and Equipment [Line Items] |
|
|
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| Useful life |
7 years |
|
|
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Automotive equipment [Member]
|
|
|
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| Property, Plant and Equipment [Line Items] |
|
|
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| Useful life |
3 years |
|
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