Financing Arrangements (Details) (USD $)	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Line of Credit Facility [Line Items]
Long-term Debt	$ 0
Borrowing capacity under line of credit	10,500,000
Maturity date of the line of credit	Nov. 30, 2016
Line of credit prime interest rate percentage	1.50%
Letters of credit issued, amount	850,000
Line of Credit Facility, Covenant Terms	200.00%
Borrowing outstanding under line of credit	0	0	0
Remaining borrowing capacity under the line of credit	9,650,000
Borrowings under the credit line	0	0	0
Noncash or Part Noncash Acquisition, Debt Assumed	11,989,000
Proceeds from revolving lines of credit	2,127,000	0	0
Repayments of Assumed Debt	(14,116,000)
Total rent and lease expense	1,977,000	2,395,000	2,095,000
Integra Plastics [Member]
Line of Credit Facility [Line Items]
Borrowing outstanding under line of credit	0
SBG Innovatiie and affiliate [Member]
Line of Credit Facility [Line Items]
Borrowing outstanding under line of credit	0
Line of Credit [Member] | Integra Plastics [Member]
Line of Credit Facility [Line Items]
Borrowing outstanding under line of credit	0
Noncash or Part Noncash Acquisition, Debt Assumed	1,465,000
Proceeds from revolving lines of credit	2,127,000
Repayments of Assumed Debt	(3,592,000)
Long-term Debt [Member] | Integra Plastics [Member]
Line of Credit Facility [Line Items]
Proceeds from Issuance of Long-term Debt	0
Long-term Debt	0
Noncash or Part Noncash Acquisition, Debt Assumed	9,876,000
Repayments of Assumed Debt	(9,876,000)
Debt to Former Owners and line of credit facility [Domain] | SBG Innovatiie and affiliate [Member]
Line of Credit Facility [Line Items]
Borrowing outstanding under line of credit	0
Noncash or Part Noncash Acquisition, Debt Assumed	648,000
Proceeds from revolving lines of credit	0
Repayments of Assumed Debt	$ (648,000)