Quarterly report pursuant to Section 13 or 15(d)

Investments in Marketable Securities (Held to Maturity Securities, by Maturity) (Details)

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Investments in Marketable Securities (Held to Maturity Securities, by Maturity) (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities $ 103,000 $ 103,000
Letters of Credit Outstanding, Amount 1,800,000 2,000,000
Held-to-maturity Securities, Current 1,308,000 1,858,000
Held-to-maturity Securities, Noncurrent 930,000 370,000
Held-to-maturity Securities, Total 2,238,000 2,228,000
Mutual Funds [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities 55,000 55,000
Cash/Money Market Accounts [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities 48,000 48,000
Held-to-maturity Securities, Current 184,000 116,000
Held-to-maturity Securities, Noncurrent 0 0
Held-to-maturity Securities, Total 184,000 116,000
US Treasury Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Current 1,029,000 1,360,000
Held-to-maturity Securities, Noncurrent 784,000 370,000
Held-to-maturity Securities, Total 1,813,000 1,730,000
US Government Agencies Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Current 95,000 382,000
Held-to-maturity Securities, Noncurrent 146,000 0
Held-to-maturity Securities, Total $ 241,000 $ 382,000