Financing Arrangements - Additional Information (Detail) (USD $)	6 Months Ended
	Jul. 31, 2014	Jan. 31, 2014
Debt Instrument [Line Items]
Borrowing available under financing arrangements	$ 4,250,000
Interest rate on borrowings under the line of credit	LIBOR plus 2.25%
Interest rate margin on referred rate	2.25%
Borrowing amount to designated to cover letters of credit issued by Bank in support of project development activities	1,350,000
Expiration date of financing arrangements	May 31, 2015
Maximum amount of standby letters of credits that may be outstanding	10,000,000
Borrowings outstanding under bank financing arrangements	$ 0	$ 0
Minimum [Member]
Debt Instrument [Line Items]
Expiration date of financing arrangements	Sep. 23, 2014
Maximum [Member]
Debt Instrument [Line Items]
Expiration date of financing arrangements	Nov. 05, 2014