6. FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Schedule assets and liabilities measured at fair value on a recurring basis

	Fair value measurement at reporting date using
	Total		Quoted Prices in Active		Significant Other		Significant
	June 30,		Markets for Identical Assets		Observable Inputs		Unobservable Inputs
Description	2013		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash equivalents:
U.S. Treasury bills	$	21,553,000	$	21,553,000	$	—		—
Money market mutual funds		1,144,000		1,144,000		—		—
Time deposits		55,000		—		55,000		—
Marketable securities:
Marketable equity securities		1,932,000		1,932,000		—		—
Corporate debt securities		1,067,000		—		1,067,000		—
Total assets	$	25,751,000	$	24,629,000	$	1,122,000	$	—

	Fair value measurement at reporting date using
	Total		Quoted Prices in Active		Significant Other		Significant
	December 31,		Markets for Identical Assets		Observable Inputs		Unobservable Inputs
Description	2012		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash equivalents:
Time deposits	$	54,000		—	$	54,000		—
Money market mutual funds		783,000	$	783,000		—		—
Marketable securities:
Corporate debt securities		662,000		—		662,000		—
Marketable equity securities		1,496,000		1,496,000		—		—
Total assets	$	2,995,000	$	2,279,000	$	716,000	$	—

Schedule of assets measured at fair value on a nonrecurring basis

	Fair value measurement at reporting date using								Total gains
	Total		Quoted Prices in Active		Significant Other		Significant		(losses for)
	June 30,		Markets for Identical Assets		Observable Inputs		Unobservable Inputs		three and six months ended
Description	2013		(Level 1)		(Level 2) (a)		(Level 3) (b)		6/30/2013
Assets:
Other investments by investment focus:
Technology & Communication	$	517,000	$	—	$	517,000	$	—	$	—
Diversified businesses		1,143,000		—		1,143,000		—		—
Real estate and related		1,449,000		—		500,000		949,000		—
Other		300,000		—		—		300,000		—
	$	3,409,000	$	—	$	2,160,000	$	1,249,000	$	—

	Fair value measurement at reporting date using								Total
	Total		Quoted Prices in Active		Significant Other		Significant		losses for
	December 31,		Markets for Identical Assets		Observable Inputs		Unobservable Inputs		year ended
Description	2012		(Level 1)		(Level 2) (a)		(Level 3) (b)		12/31/2012
Assets:
Other investments by investment focus:
Technology & Communication	$	514,000	$	—	$	514,000	$	—	$	—
Diversified businesses		1,337,000		—		1,337,000		—		—
Real estate and related		1,453,000		—		500,000		953,000		28,000
Other		300,000		—		—		300,000		—
	$	3,604,000	$	—	$	2,351,000	$	1,253,000	$	28,000

Schedule of other investments measured at fair value on a non recurring basis

	Level 3 Investments:
Balance at January 1, 2013	$	1,253,000
Additional investment in limited partnership		—
Distributions from Level 3 investments		(4,000	)
Transfers from Level 2		—
Balance at June 30, 2013	$	1,249,000