13. FAIR VALUE MEASUREMENTS (Details) (USD $)	Dec. 31, 2012
Short-term deposits	$ 105,000
Restricted term deposits	3,615,000
Total assets measured at fair value	34,033,000
Percentage of total assets	10.90%
Fair Value Inputs Level 1 [Member]
Short-term deposits	105,000
Restricted term deposits	3,615,000
Total assets measured at fair value	34,033,000
Percentage of total assets	10.90%
Fair Value Inputs Level 2 [Member]
Short-term deposits
Restricted term deposits
Total assets measured at fair value
Percentage of total assets
Fair Value Inputs Level 3 [Member]
Short-term deposits
Restricted term deposits
Total assets measured at fair value
Percentage of total assets