Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Fixed interest rate related to the interest rate derivative.

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Amount of decrease in the fair value of derivatives recognized in the income statement.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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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Note 12 - Indebtedness (Details Textual) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Feb. 01, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Interest Rate Swap [Member]
Derivative, Notional Amount	$ 20,000	$ 15,700		$ 15,700
Derivative, Term of Contract	5 years
Derivative, Fixed Interest Rate	2.70%
Interest Rate Swap [Member] \| Other Nonoperating Income (Expense) [Member]
Derivative, Loss on Derivative		198	$ 3	437	$ 53
Interest Rate Swap [Member] \| Other Current Liabilities [Member]
Derivative, Fair Value, Net, Total		(373)		(373)		$ 64
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member]
Debt Instrument, Face Amount	$ 70,000
Letters of Credit Outstanding, Amount		$ 700		$ 700
Debt Instrument, Interest Rate, Effective Percentage		3.40%		3.40%
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member] \| Prime Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member] \| Unsecured Term Loan [Member]
Debt Instrument, Face Amount	$ 20,000
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member] \| Unsecured Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50,000
Subsidiary Guarantors [Member] \| Unsecured Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%