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Note 2 - Newly Adopted Accounting Pronouncements (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Accounts Receivable, Allowance for Credit Loss [Table Text Block] |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Balance at beginning of year |  | $ | 3.6 |  |  | $ | 2.5 |  |  | $ | 2.4 |
Charged to costs and expenses |  |  | 2.2 |  |  |  | 2.5 |  |  |  | 0.4 |
Reclassification(1) |  |  | — |  |  |  | 0.5 |  |  |  | 0.8 |
Charged to other accounts(2) |  |  | — |  |  |  | — |  |  |  | (0.2 | )
Deductions(3) |  |  | (1.2 | ) |  |  | (1.9 | ) |  |  | (0.9 | )
Balance at end of year |  | $ | 4.6 |  |  | $ | 3.6 |  |  | $ | 2.5 |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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Balance Type: | na
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration