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

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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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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fixed interest rate related to the interest rate derivative.

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Amount of increase 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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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 ($)			3 Months Ended	9 Months Ended
Note 12 - Indebtedness (Details Textual) - USD ($)	Feb. 01, 2018	Dec. 02, 2013	Sep. 30, 2018	Sep. 30, 2018
Interest Rate Swap [Member]
Derivative, Notional Amount	$ 20,000,000		$ 17,857,142	$ 17,857,142
Derivative, Term of Contract	5 years
Derivative, Fixed Interest Rate			2.70%	2.70%
Interest Rate Swap [Member] \| Other Nonoperating Income (Expense) [Member]
Derivative, Gain on Derivative			$ 85,000	$ 137,000
Interest Rate Swap [Member] \| Other Assets [Member]
Derivative Asset, Total			$ 137,000	$ 137,000
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 40,000,000
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate		1.00%
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Revolving Credit Facility [Member] \| Prime Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate		0.25%
Amended and Restated Credit Agreement [Member] \| Subsidiary Guarantors [Member]
Debt Instrument, Face Amount	$ 70,000,000
Debt Instrument, Interest Rate, Effective Percentage			3.26%	3.26%
Amended and Restated Credit Agreement [Member] \| Subsidiary Guarantors [Member] \| Unsecured Term Loan [Member]
Debt Instrument, Face Amount	20,000,000
Amended and Restated Credit Agreement [Member] \| Subsidiary Guarantors [Member] \| Unsecured Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	50,000,000
Amended and Restated Credit Agreement [Member] \| Subsidiary Guarantors [Member] \| Standby Letters of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600,000
Amended and Restated Credit Agreement [Member] \| Prime Rate [Member] \| Maximum [Member] \| Subsidiary Guarantors [Member]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Unsecured Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member] \| Subsidiary Guarantors [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Unsecured Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member] \| Subsidiary Guarantors [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%