FAIR VALUE INSTRUMENTS - Summary of fair value measurements of financial Instruments on a recurring basis (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Total
Cash equivalents:
Time deposits	$ 55,000	$ 54,000
Money market mutual funds	1,257,000	783,000
U.S. T-bills	15,305,000
Marketable securities:
Corporate debt securities	1,065,000	662,000
Marketable equity securities	3,658,000	1,497,000
Total assets	21,340,000	2,996,000
Liabilities:
Interest rate swap contract		1,965,000
Total liabilities		1,965,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Cash equivalents:
Money market mutual funds	1,257,000	783,000
U.S. T-bills	15,305,000
Marketable securities:
Marketable equity securities	3,658,000	1,497,000
Total assets	20,220,000	2,280,000
Significant Other Observable Inputs (Level 2)
Cash equivalents:
Time deposits	55,000	54,000
Marketable securities:
Corporate debt securities	1,065,000	662,000
Total assets	1,120,000	716,000
Liabilities:
Interest rate swap contract		1,965,000
Total liabilities		$ 1,965,000