Quarterly Financial Data (unaudited) (Detail) (USD $)	3 Months Ended							12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Gain on Business Interruption Insurance Recovery	$ 6,778	$ 1,940	$ (120)
Increase (Decrease) In Valuation Allowance due to Expected Realization of Deferred Tax Assets	104,000	1,215,000
Earnings Per Share, Basic								$ 1.32	$ (0.29)
Earnings Per Share, Diluted								$ 1.32	$ (0.29)
Tax effect of discontinued operations				528,000
Gain on sale of discontinued operations							1,406,000
Governance, proxy dispute and related expenses				3,404,000	1,802,000	259,000
Severance costs				1,525,000
Gain on sale of joint venture interest								8,290,000	0
Gain on sale of equipment previously impaired								$ (38,000)	$ (47,000)