Joplin Acquisition (Detail) (USD $)			0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Apr. 02, 2014 Subsequent Event Joplin Plant
Business Acquisition [Line Items]
Business acquisition, cash paid			$ 6,000,000
Cash	17,308,000	4,930,000	7,400,000
Restricted cash	300,000	0	300,000
Number of years the plant produced as primary manufacturer			10 years
Production supply accounted by the plant currently			40.00%
Duration of supply agreement, in years			3 years
Preliminary Allocation of Aggregate Cost
Machinery and equipment			4,463,000
Inventory			1,495,000
Building and improvement			920,000
Goodwill	30,809,000	30,809,000	450,000
Land			180,000
Total purchase price			$ 7,508,000