Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Securities (Details)

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Investments in Marketable Securities (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities $ 103,000 $ 92,000
Available-for-sale Securities, Gross Unrealized Gains 16,000 11,000
Letters of Credit Outstanding, Amount 2,000,000 2,600,000
Held-to-maturity Securities, Current 1,858,000 2,008,000
Held-to-maturity Securities, Noncurrent 370,000 1,788,000
Held-to-maturity Securities 2,228,000 3,796,000
Equity Funds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 55,000 44,000
Money Market Funds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 48,000 48,000
Held-to-maturity Securities, Current 116,000 76,000
Held-to-maturity Securities, Noncurrent 0 0
Held-to-maturity Securities 116,000 76,000
US Treasury Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Held-to-maturity Securities, Current 1,360,000 1,051,000
Held-to-maturity Securities, Noncurrent 370,000 1,399,000
Held-to-maturity Securities 1,730,000 2,450,000
US Government Agencies Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Held-to-maturity Securities, Current 382,000 881,000
Held-to-maturity Securities, Noncurrent 0 389,000
Held-to-maturity Securities $ 382,000 $ 1,270,000