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Note 9 - Debt (Details Textual) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 USD ($) | Apr. 18, 2017 USD ($)
Finance Lease, Liability, Current | $ 0.1 |  |  | $ 0.2 |
Long-term Debt, Total | $ 311.6 |  |  |  |
Debt, Weighted Average Interest Rate, Net of Currency Swap Contract | 4.50% |  |  |  |
Secured Debt [Member] |  |  |  |  |
Long-term Debt, Current Maturities, Total | $ 0.8 |  |  |  |
Debt Including Related Cross-currency Swap Instrument [Member] |  |  |  |  |
Debt, Weighted Average Interest Rate | 5.50% |  |  |  |
The 2017 Credit Agreement [Member] |  |  |  |  |
Debt Instrument, Covenant, Adjusted EBITDA, Maximum |  |  | 4.00 | 4.50 |
Debt Instrument, Covenant, Adjusted EBITDA to Interest Expense Ratio, Minimum |  |  | 3.50 |  |
Debt Instrument, Covenant, Senior Secured Net Indebtedness to Adjusted EBITDA Ratio, Maximum |  |  | 3.50 | 4.00 |
Long-term Debt, Current Maturities, Total | $ 10.0 |  |  |  |
Long-term Debt, Total | 10.0 |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount | 186.7 |  |  |  |
Line of Credit Facility, Commitment Fee Amount | 0.6 |  |  |  |
The 2017 Credit Agreement [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.50% |  |
The 2017 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.00% |  |
Debt Instrument, Variable Rate Floor |  |  | 0.00% |  |
The 2017 Credit Agreement [Member] | LIBOR on Eurocurrency Liabilities [Member] |  |  |  |  |
Debt Instrument, Variable Rate Floor |  |  | 0.00% |  |
The 2017 Credit Agreement [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument, Covenant, Repayment of Debt if Net Leverage Ratio is Less than 3.00, Percentage of Excess Cash Flow |  | 25.00% |  |  |
The 2017 Credit Agreement [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.25% |  |
The 2017 Credit Agreement [Member] | Minimum [Member] | LIBOR on Eurocurrency Liabilities [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.25% |  |
The 2017 Credit Agreement [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument, Covenant, Repayment of Debt if Net Leverage Ratio is Less than 3.00, Percentage of Excess Cash Flow |  | 50.00% |  |  |
The 2017 Credit Agreement [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.25% |  |
The 2017 Credit Agreement [Member] | Maximum [Member] | LIBOR on Eurocurrency Liabilities [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.25% |  |
The 2017 Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  | 0.175% |  |
The 2017 Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.075% |  |
The 2017 Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | LIBOR on Eurocurrency Liabilities [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.075% |  |
The 2017 Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  | 0.35% |  |
The 2017 Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.90% |  |
The 2017 Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | LIBOR on Eurocurrency Liabilities [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.90% |  |
The 2017 Credit Agreement [Member] | Letter of Credit [Member] |  |  |  |  |
Long-term Line of Credit, Total | 3.3 |  |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 300.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.625%
Debt Instrument, Notes Repurchase Price As Percentage Of Principal Amount In Changes Of Control |  |  |  |  | 101.00%
Debt Instrument, Notes Repurchase Price As Percentage Of Principal Amount When Not Use Asset Sales Proceeds For Specific Purposes |  |  |  |  | 100.00%
Long-term Debt, Total | $ 300.0 |  |  |  |

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- Definition The minimum adjusted EBITDA to interest expense ratio allowed under the covenant of the debt instrument. + References No definition available. + Details
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- Definition The percentage of excess cash flow that must be used to repay debt if the net leverage ratio is less than 3.00 under the covenant of the debt instrument. + References No definition available. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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