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Schedule II (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 289,000 $ 141,000 $ 258,000
(Recovered)/Charged to Costs and Expenses (159,000) 197,000 51,000
Charged to Other Accounts 0 0 0
Deductions [1] 90,000 49,000 168,000
Balance at End of Year $ 40,000 $ 289,000 $ 141,000
[1] Amount represents uncollectible accounts written off.