Debt (Narrative) (Details) - USD ($)			9 Months Ended
	Mar. 19, 2018	Apr. 04, 2016	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Dec. 22, 2011
Line of Credit Facility [Line Items]
Dividends	$ 2,000,000
Debt instrument, covenant, minimum EBITDA				$ 6,402,000	$ (3,767,000)
Maximum borrowing capacity	$ 60,000,000					$ 50,000,000
Covenant, minimum fixed charge coverage ratio			1.10
Non-refundable extension fee			$ 250,000
Maximum amount outstanding during period			$ 60,000,000
Increase accrued interest percentage			2.00%
Interest rate at period end			6.25%
Provision to reduce borrowings under the line		$ 8,000,000
Provision to reduce borrowings under the line, period		30 days
Judicial actions against excess line of credit facility			$ 250,000
Accounts Receivable [Member]
Line of Credit Facility [Line Items]
Borrowing base limitation			85.00%
Inventory [Member]
Line of Credit Facility [Line Items]
Borrowing base limitation			60.00%
Maximum [Member]
Line of Credit Facility [Line Items]
Current borrowing capacity			$ 14,000,000
Maximum [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of			2.50%
Maximum [Member] | Alternate Base Rate Loans [Member] | London Interbank Offered Rate LIBOR [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of			1.50%
Maximum [Member] | Accounts Receivable [Member]
Line of Credit Facility [Line Items]
Borrowing base limitation			85.00%
Minimum [Member]
Line of Credit Facility [Line Items]
Current borrowing capacity			$ 8,000,000
Minimum [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of			1.50%
Minimum [Member] | Alternate Base Rate Loans [Member] | London Interbank Offered Rate LIBOR [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of			0.50%
Revolving Credit Facility [Member] | PNC [Member]
Line of Credit Facility [Line Items]
Remaining borrowing capacity			$ 9,930,000
Revolving Credit Facility [Member] | Amendment No. 7 To The Credit Agreement [Member] | PNC [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			3,000,000
Capacity available for equipment financing			$ 2,500,000