Debt (Narrative) (Details)		1 Months Ended		3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Aug. 01, 2017 USD ($)	Apr. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jul. 31, 2019 USD ($)	Oct. 31, 2019 USD ($)	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	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 bears interest increased							2.00%
Interest rate	4.00%						6.25%
Dividends							$ 930,000	$ 230,000
Purchase agreement nonbinding commitment	$ 7,200,000
Purchase agreement nonbinding commitment down payment	20.00%
Purchase Agreement, Non-binding Commitment, Seller Financed Portion	$ 5,760,000
Purchase Agreement, Non-binding Commitment, Financing Period	20 years
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]
Line Of Credit Facility, Borrowing Capacity, Term							$ 8,000,000
Maximum [Member]
Line of Credit Facility [Line Items]
Line Of Credit Facility, Borrowing Capacity, Term							$ 14,000,000
Maximum [Member] | Accounts receivable [Member]
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation							85.00%
Amendment No. 17 to Credit Facility [Member]
Line of Credit Facility [Line Items]
Minimum EBITDA									$ 6,402,000	$ (3,767,000)
Revolving credit facility							$ 60,000,000	$ 50,000,000
Dividends	$ 2,000,000
Maximum fixed charge coverage ratio							1.10
Non-refundable Extension Fee							$ 250,000
PNC [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity							60,000,000
Line of credit facility, Equipment financing							2,500,000
Revolving Advances											$ 11,000,000	$ 14,000,000
Remaining borrowing capacity							11,231,000
PNC [Member] | Revolving Credit Facility [Member] | Amendment To Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, Equipment financing							2,500,000
PNC [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity							$ 3,000,000
Eurodollar [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of							1.75%
Eurodollar [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility bears interest range of							2.25%
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							0.75%
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							1.25%
Subsequent Event [Member] | Amendment No. 19 to Credit Facility [Member]
Line of Credit Facility [Line Items]
Non-refundable Extension Fee			$ 24,000
Subsequent Event [Member] | Amendment No. 20 To Credit Facility [Member]
Line of Credit Facility [Line Items]
Minimum EBITDA		$ 5,000,000		$ 5,000,000
Maximum fixed charge coverage ratio		1.10		1.10	2.25
Non-refundable Extension Fee		$ 125,000
Subsequent Event [Member] | Amendment No. 20 To Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Covenant, Capital Expenditures Limit				$ 900,000
Debt Instrument, Covenant, Aggregate Debt		$ 8,000,000		$ 8,000,000
Subsequent Event [Member] | 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
Line Of Credit, Clean Down Limit			10,000,000
Line Of Credit, Short-Term Borrowings Limit			2,000,000
Subsequent Event [Member] | PNC [Member] | Seasonal Advance [Member] | Amendment No. 19 to Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			15,000,000
Subsequent Event [Member] | 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
Scenario, Forecast [Member] | Subsequent Event [Member] | Amendment No. 20 To Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Covenant, Capital Expenditures Limit					$ 1,900,000
Debt Covenant Term One [Member] | Scenario, Forecast [Member] | Subsequent Event [Member] | Amendment No. 20 To Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Covenant, Capital Expenditures Limit						$ 3,900,000
Debt Instrument, Covenant, Capital Expenditure Limit Term On EBITDA						8,500,000
Debt Covenant Term Two [Member] | Scenario, Forecast [Member] | Subsequent Event [Member] | Amendment No. 20 To Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Covenant, Capital Expenditures Limit						2,900,000
Debt Instrument, Covenant, Capital Expenditure Limit Term On EBITDA						$ 8,500,000