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Note 10 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amortization of Intangible Assets, Total |  | $ 1,200 | $ 1,200 | $ 1,600
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  | 700 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  | 700 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three |  | 700 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  | 700 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five |  | 700 |  |
Goodwill, Impairment Loss |  | 0 | $ 0 |
National Reporting Unit [Member] |  |  |  |
Goodwill, Impairment Loss |  | $ 0 |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  | 18.00% |  |
Reporting Unit, Percentage of Parent Company Total Assets |  | 4.00% |  |
Bayou City Pump Inc [Member] |  |  |  |
Goodwill, Impairment Loss | $ 900 |  |  | $ 900

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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