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Note 5 - Debt (Details Textual) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
	Apr. 22, 2016	Apr. 30, 2016	Mar. 31, 2016	Mar. 25, 2016	Mar. 24, 2016	Dec. 31, 2015
Credit Agreement [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 40,000
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | Second Montana Acquisition [Member] | Subsequent Event [Member]
Proceeds from Lines of Credit		$ 25,000
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.25%
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.30%
Amended Credit Agreement [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 50,000	$ 50,000
Amended Credit Agreement [Member] | Incremental Term Loans [Member]
Debt Instrument, Face Amount				$ 40,000
Amended Credit Agreement [Member] | Term Loan [Member]
Debt Instrument, Face Amount			160,000
Long-term Debt			157,000
Amended Credit Agreement [Member] | Loans Payable [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument, Periodic Payment			1,500
Amended Credit Agreement [Member] | Loans Payable [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument, Periodic Payment			2,000
Amended Credit Agreement [Member] | Loans Payable [Member] | Debt Instrument, Redemption, Period Three [Member]
Debt Instrument, Periodic Payment			3,000
Amended Credit Agreement [Member] | Loans Payable [Member] | Debt Instrument, Redemption, Period Four [Member]
Debt Instrument, Periodic Payment			4,000
Amended Credit Agreement [Member] | Loans Payable [Member] | Debt Instrument, Redemption, Period Five [Member]
Debt Instrument, Periodic Payment			6,000
Amended Credit Agreement [Member] | Loans Payable [Member] | Debt Instrument, Redemption Period, Period Six [Member]
Debt Instrument, Periodic Payment			$ 95,000
Amended Credit Agreement [Member] | Federal Funds Effective Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			0.50%
Amended Credit Agreement [Member] | Eurodollar [Member]
Debt Instrument, Basis Spread on Variable Rate			1.00%
Amended Credit Agreement [Member]
Debt, Weighted Average Interest Rate			3.18%
Beneficial Ownership Threshold			30.00%
Revolving Credit Facility [Member] | Second Montana Acquisition [Member] | Subsequent Event [Member]
Proceeds from Lines of Credit	$ 25,000
Term Loan [Member]
Long-term Debt			$ 157,000			$ 118,500
Long-term Debt			$ 158,780			$ 146,098

X

- Definition

The maximum percentage of the acquisition of beneficial ownership of the Company's equity securities.

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Weighted average interest rate of debt outstanding.

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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