Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Securities (Details)

v2.4.1.9
Investments in Marketable Securities (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities $ 107,000us-gaap_AvailableForSaleSecurities $ 103,000us-gaap_AvailableForSaleSecurities
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 16,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 16,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Letters of Credit Outstanding, Amount 1,400,000us-gaap_LettersOfCreditOutstandingAmount 2,000,000us-gaap_LettersOfCreditOutstandingAmount
Held-to-maturity Securities, Current 534,000us-gaap_HeldToMaturitySecuritiesCurrent 1,858,000us-gaap_HeldToMaturitySecuritiesCurrent
Held-to-maturity Securities, Noncurrent 1,057,000us-gaap_HeldToMaturitySecuritiesNoncurrent 370,000us-gaap_HeldToMaturitySecuritiesNoncurrent
Held-to-maturity Securities 1,591,000us-gaap_HeldToMaturitySecurities 2,228,000us-gaap_HeldToMaturitySecurities
Equity Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 59,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_EquityFundsMember
55,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_EquityFundsMember
Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities 48,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MoneyMarketFundsMember
48,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MoneyMarketFundsMember
Held-to-maturity Securities, Current 204,000us-gaap_HeldToMaturitySecuritiesCurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_MoneyMarketFundsMember
116,000us-gaap_HeldToMaturitySecuritiesCurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_MoneyMarketFundsMember
Held-to-maturity Securities, Noncurrent 0us-gaap_HeldToMaturitySecuritiesNoncurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_MoneyMarketFundsMember
0us-gaap_HeldToMaturitySecuritiesNoncurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_MoneyMarketFundsMember
Held-to-maturity Securities 204,000us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MoneyMarketFundsMember
116,000us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MoneyMarketFundsMember
US Treasury Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Held-to-maturity Securities, Current 105,000us-gaap_HeldToMaturitySecuritiesCurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
1,360,000us-gaap_HeldToMaturitySecuritiesCurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
Held-to-maturity Securities, Noncurrent 965,000us-gaap_HeldToMaturitySecuritiesNoncurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
370,000us-gaap_HeldToMaturitySecuritiesNoncurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
Held-to-maturity Securities 1,070,000us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
1,730,000us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
US Government Agencies Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Held-to-maturity Securities, Current 225,000us-gaap_HeldToMaturitySecuritiesCurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
382,000us-gaap_HeldToMaturitySecuritiesCurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Held-to-maturity Securities, Noncurrent 92,000us-gaap_HeldToMaturitySecuritiesNoncurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
0us-gaap_HeldToMaturitySecuritiesNoncurrent
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Held-to-maturity Securities $ 317,000us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
$ 382,000us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember