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Business and Significant Accounting Policy - Fair Value Assets and Liabilities (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Assets    
Marketable equity securities Level 1 $ 6,104,000 $ 10,361,000
Marketable equity securities Level 2      
Marketable equity securities Level 3      
Marketable equity securities Total 6,104,000 10,361,000
Other current assets - Ely Warrants Level 1      
Other current assets - Ely Warrants Level 2 23,000 74,000
Other current assets - Ely Warrants Level 3      
Other current assets - Ely Warrants Total 23,000 74,000
Other current assets - ILC warrants Level 1      
Other current assets - ILC warrants Level 2 1,000 4,000
Other current assets - ILC warrants Level 3      
Other current assets - ILC warrants Total $ 1,000 $ 4,000