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Debt (Narrative) (Details)	6 Months Ended
	Jul. 31, 2020 USD ($)	Sep. 08, 2020 USD ($)	Feb. 01, 2020 USD ($)
Line of Credit Facility [Line Items]
Line Of Credit Facility, Borrowing Capacity, Term	$ 15,000,000
Line of credit facility, period for reduced borrowings during fourth quarter of each fiscal year (consecutive days)	30 days
Revolving credit facility bears interest increased	2.00%
Interest rate	4.50%
Unused portion fee rate	0.375%
Inventory [Member]
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation	60.00%
Inventories [Member]
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation	85.00%
Maximum [Member] | Accounts receivable [Member]
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation	85.00%
Amendment No. 20 To Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum fixed charge coverage ratio			1.10
Amendment No. 20 To Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Maximum capital expenditures			$ 8,000,000
Amendment No. 21 To Credit Facility [Member] | Subsequent Event
Line of Credit Facility [Line Items]
Non-refundable fee		$ 75,000
Amendment No. 21 To Credit Facility [Member] | Subsequent Event | Consecutive Four Fiscal Quarters Ending July 31, 2020
Line of Credit Facility [Line Items]
Maximum fixed charge coverage ratio		1.10
Amendment No. 21 To Credit Facility [Member] | Subsequent Event | Consecutive Four Fiscal Quarters Ending October 31, 2020
Line of Credit Facility [Line Items]
Maximum fixed charge coverage ratio		1.00
Amendment No. 21 To Credit Facility [Member] | Subsequent Event | Consecutive Four Fiscal Quarters Ending Thereafter
Line of Credit Facility [Line Items]
Maximum fixed charge coverage ratio		1.10
Amendment No. 21 To Credit Facility [Member] | Minimum [Member] | Consecutive Four Fiscal Quarters Ending Thereafter
Line of Credit Facility [Line Items]
Maximum fixed charge coverage ratio	1.00
Amendment No. 21 To Credit Facility [Member] | Maximum [Member] | Consecutive Four Fiscal Quarters Ending Thereafter
Line of Credit Facility [Line Items]
Maximum fixed charge coverage ratio	1.10
PNC [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Remaining borrowing capacity	$ 32,896,000
PNC [Member] | Revolving Credit Facility [Member] | Amendment No. 19 to Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	65,000,000
PNC [Member] | Equipment Loan [Member] | Amendment No. 19 to Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	10,000,000
Line of credit facility, Equipment financing	$ 2,000,000
Eurodollar [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of	2.25%
Eurodollar [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of	2.75%
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	1.25%
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	1.75%

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- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
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- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

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