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Debt (Narrative) (Details)
 1 Months Ended 12 Months Ended
Aug. 01, 2017
USD ($)
Aug. 31, 2017
Jan. 31, 2018
USD ($)
Jan. 31, 2017
USD ($)
Jul. 31, 2018
USD ($)
Apr. 30, 2018
USD ($)
Jul. 01, 2017
USD ($)
Jun. 30, 2017
USD ($)
Line of Credit Facility [Line Items]                
Revolving credit facility     $ 60,000,000 $ 50,000,000        
Revolving credit facility bears interest increased     2.00%          
Interest rate 4.00%   5.00%          
Dividends $ 2,000,000   $ 230,000          
Purchase agreement nonbinding commitment $ 7,200,000              
Purchase agreement nonbinding commitment down payment 20.00% 20.00%            
Purchase Agreement, Non-binding Commitment, Seller Financed Portion $ 5,760,000              
Purchase Agreement, Non-binding Commitment, Financing Period 20 years              
Maximum fixed charge coverage ratio     1.10          
Non-refundable Extension Fee     $ 250,000          
Debt Instrument, Covenant, Achieved EBITDA     10,254,000          
Provision to reduce borrowings under the line     $ 8,000,000          
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     $ 7,400,000          
Maximum fixed charge coverage ratio     1.41          
PNC [Member] | Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Revolving Advances             $ 11,000,000 $ 14,000,000
Remaining borrowing capacity     $ 15,961,000          
PNC [Member] | Revolving Credit Facility [Member] | Amendment To Credit Agreement [Member]                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity     3,000,000          
Line of credit facility, Equipment financing     $ 2,500,000          
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%          
Subsequent Event [Member]                
Line of Credit Facility [Line Items]                
Minimum EBITDA         $ 6,402,000 $ 3,767,000