Debt (Narrative) (Details)	12 Months Ended
	Jan. 31, 2017 USD ($)	Dec. 22, 2011 USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2,500,000
Revolving credit facility	49,500,000
Sub-limit for issuances of letters of credit	$ 3,000,000
Revolving Credit Facility bears interest increased	2.00%
Debt Covenant, Maximum Annual Dividends And Stock Repurchases	$ 1,300,000
Maximum fixed charge coverage ratio	5.85
Debt Instrument, Covenant, Achieved EBITDA	$ 11,578,000
Provision to reduce borrowings under the line	$ 6,000,000
Provision to reduce borrowings under the line, period	30 days
Judgments or judicial actions against the borrowers in excess	$ 250,000
Accounts receivable [Member]
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation	85.00%
Inventory [Member]
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation	60.00%
Minimum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility	$ 8,000,000
Maximum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility	$ 14,000,000
Maximum [Member] | Accounts receivable [Member]
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation	85.00%
Credit Agreement [Member]
Line of Credit Facility [Line Items]
Minimum EBITDA	$ 7,304,000
Maximum fixed charge coverage ratio	1.10
Revolving Credit Facility [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 49,500,000
Revolving Credit Facility [Member] | Equipment Line [Member]
Line of Credit Facility [Line Items]
Sub-limit for issuances of letters of credit	$ 2,500,000
PNC [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Remaining borrowing capacity	$ 22,015,000
Eurodollar [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of	1.50%
Eurodollar [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of	2.50%
Alternate Base Rate Loans [Member] | London Interbank Offered Rate LIBOR [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of	0.50%
Alternate Base Rate Loans [Member] | London Interbank Offered Rate LIBOR [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of	1.50%