DEBT (Details)	6 Months Ended
	Jul. 31, 2012 USD ($)	Jan. 31, 2012 USD ($)	Jul. 31, 2012 Domestic and foreign unsecured lines of credit [Member] USD ($)	Jul. 31, 2012 Domestic unsecured line of credit [Member] USD ($)	Jan. 31, 2012 Domestic unsecured line of credit [Member] USD ($)	Jul. 31, 2012 Domestic unsecured line of credit [Member] Standby letters of credit expiring 2013 [Member] USD ($)	Jul. 31, 2012 Domestic unsecured line of credit [Member] Standby letters of credit expiring 2014 [Member] USD ($)	Jul. 31, 2012 Foreign unsecured line of credit [Member] USD ($)	Jul. 31, 2012 Foreign unsecured line of credit [Member] EUR (€)	Jan. 31, 2012 Foreign unsecured line of credit [Member] USD ($)	Jan. 31, 2012 Foreign unsecured line of credit [Member] EUR (€)
Line of Credit Facility [Line Items]
Available borrowing capacity under lines of credit			$ 4,369,210					$ 369,120	€ 300,000
Amount committed to standby letters of credit			2,915,641			2,314,685	600,596
Amount outstanding under lines of credit				0	0			213,081	173,180	265,581	202,997
Interest rate swap agreement [Abstract]
Term of interest rate swap (in years)	15 years
Variable rate basis	ninety-day LIBOR
Fixed interest rate (in hundredths)	4.87%
Effective fixed interest rate (in hundredths)	6.90%
Interest rate floor provision (in basis points)	250
Decrease in equity to date resulting from fair value of interest rate swap agreement	$ (225,015)	$ (230,760)