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Note 13 - Long-term Debt and Credit Arrangements (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Nov. 30, 2019
Long-term Debt, Current Maturities, Total | $ 8,718 | $ 8,253 | $ 8,718 | $ 8,253 | $ 8,278 |
Long-term Debt, Excluding Current Maturities, Total | $ 331,192 | 405,644 | $ 331,192 | 405,644 | 330,522 |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.76% |  |  |
The Credit Agreement [Member] |  |  |  |  |  |
Consolidated Leverage Ratio, Actual | 1.73 |  | 1.73 |  |  |
Consolidated Leverage Ratio, Covenant Maximum | 3.00 |  | 3.00 |  |  |
Consolidated Interest Coverage Ratio, Actual | 8.52 |  | 8.52 |  |  |
Debt Instrument, Covenant, Minimum Consolidated Interest Coverage Ratio | 4.00 |  | 4.00 |  |  |
The Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.63% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 2.38% |  | 2.38% |  |  |
The Credit Agreement [Member] | Base Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.63% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.88% |  | 3.88% |  |  |
The Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 227,900 |  | $ 227,900 |  |  |
Letters of Credit Outstanding, Amount | 47,100 |  | 47,100 |  |  |
Long-term Line of Credit, Total | 0 |  | 0 |  |  |
The Credit Agreement [Member] | Term Loan [Member] |  |  |  |  |  |
Long-term Debt, Current Maturities, Total | 7,500 | 7,500 | 7,500 | 7,500 | 7,500 |
Long-term Debt, Excluding Current Maturities, Total | 118,100 | 125,600 | 118,100 | 125,600 | 123,800 |
The 2.75% Convertible Notes [Member] |  |  |  |  |  |
Long-term Debt, Gross | 205,500 | 198,600 | 205,500 | 198,600 | 200,300 | $ 192,600
Debt Instrument, Unamortized Discount, Total | 24,500 | 31,400 | 24,500 | 31,400 | $ 29,700 |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total | $ 1,700 | $ 1,700 | $ 5,200 | $ 4,900 |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.75% | 2.75% | 2.75% | 2.75% | 2.75% | 2.75%
Amortization of Debt Discount (Premium) | $ 600 | $ 500 | $ 1,800 | $ 1,600 |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: 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 Reference 3: 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 4: 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 + 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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