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Revolving Credit Facility (Details)			6 Months Ended
	Apr. 16, 2019 USD ($)	Apr. 12, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Bank of America, N.A. [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date			Jul. 26, 2019
Outstanding borrowings				$ 0
Bank of America, N.A. [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings				$ 4,789,000
BMO Harris Bank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date			Apr. 12, 2024
Outstanding borrowings			$ 0
Aggregate principal amount		$ 50,000,000
Maximum borrowing capacity		$ 42,500,000
Value of eligible accounts		85.00%
Value of eligible accounts supported by credit insurance		90.00%
Liquidation value		85.00%
Cost of eligible inventory		75.00%
Limitation amount		$ 30,000,000
Reduction of credit facility		$ 7,500,000
Reduction of credit facility, percentage		15.00%
BMO Harris Bank [Member] | Revolving Sub-Credit Facility [Member]
Line of Credit Facility [Line Items]
Aggregate principal amount		$ 10,000,000
M & T Bank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date			Apr. 16, 2021
Outstanding borrowings			$ 10,200,000
Collateral carrying value			$ 16,647,000
Aggregate principal amount	$ 40,000,000
Interest coverage ratio	1.25
Interest rate			4.45%

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Line of Credit Facility, Collateral Amount

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- Definition

Line Of Credit Facility, Limit Availability, Amount

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- Definition

Line Of Credit Facility, Limit Availability, Amount Reduced

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- Definition

Line Of Credit Facility, Limit Availability, Cost Of Eligible Inventory

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- Definition

Line Of Credit Facility, Limit Availability, Liquidation Value

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- Definition

Line Of Credit Facility, Limit Availability, Percentage Reduced

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- Definition

Line Of Credit Facility, Limit Availability, Value Of Eligible Accounts

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- Definition

Line Of Credit Facility, Limit Availability, Value Of Eligible Accounts Supported By Insurance

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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