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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

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