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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 |  |

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