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Note J - Acquisition (Details Textual) - USD ($) | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2013
Hydro Companies [Member] | Customer Relationships [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 748,000 |  |  |  |
Hydro Companies [Member] | Technology and Drawings [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 130,000 |  |  |  |
Hydro Companies [Member] | Trademarks and Trade Names [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | 70,000 |  |  |  |
Hydro Companies [Member] |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 1,900,000 |  |  |  |
Approximate Annual Revenues | 4,000,000 |  |  |  |
Goodwill | $ 2,400,000 |  |  |  |
Bayou City Pump Inc [Member] | Customer Relationships [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | $ 4,100,000 |
Bayou City Pump Inc [Member] | Technology and Drawings [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | 830,000 |
Bayou City Pump Inc [Member] | Trademarks and Trade Names [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  |  |  | 370,000 |
Bayou City Pump Inc [Member] |  |  |  |  |
Goodwill |  |  |  | $ 4,700,000 |
National Pump Company [Member] |  |  |  |  |
Reporting Unit, Goodwill as Percentage of Total Assets |  | 4.50% |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  | 10.00% |  |  |
Goodwill |  | $ 24,559,000 | $ 22,615,000 |  | $ 18,046,000

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