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Note 15 - Subsequent Event	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	15 . Subsequent Event On July  27, 2018, the Company completed the acquisition of Ameron Water Transmission Group, LLC (“Ameron”) for a purchase price of approximately  $38.3  million. Ameron is a major supplier of engineered welded steel pressure pipe as well as reinforced concrete pipe. Headquartered in Rancho Cucamonga, California, Ameron has pipe operations in Tracy, California and San Luis Río Colorado, Mexico, as well as a protective lining facility in Brea, California.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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