UNIVERSAL ACQUISITION UNIVERSAL purchase price allocation (Details) - USD ($)		3 Months Ended		12 Months Ended
	Jan. 11, 2017	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Cash	$ 4,379,000
Accounts receivable	11,270,000
Contracts in progress	3,167,000
Inventories	4,585,000
Other assets	579,000
Property, plant and equipment	16,692,000
Goodwill	14,413,000
Identifiable intangible assets	19,500,000	$ 19,500,000		$ 275,000
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets	935,000
Current liabilities	(10,833,000)
Other noncurrent liabilities	(1,423,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	(6,338,000)
Net acquisition cost	56,926,000
Payments to Acquire Businesses, Net of Cash Acquired		52,547,000	$ 0
Amortization of Intangible Assets		6,012,000		$ 1,538,000
Acquisition employee number	460
Revenues		391,104,000	404,116,000
Business Acquisition, Transaction Costs	$ 200,000
Gross Profit		62,900,000	$ 80,156,000
Acquired Business Annual Sales		80,000,000
Operating Segments [Member] | Universal [Member]
Revenues		21,200,000
Gross Profit		4,900,000
Universal [Member]
Amortization of Intangible Assets		1,500,000
Business Combination, Acquisition Related Costs		$ 1,000,000