5. Assets and liabilities measured at fair value on a recurring basis are summarized below (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Cash equivalents:
U.S. Treasury bills	$ 4,170,000	$ 55,000
Money market mutual funds	1,502,000	1,257,000
Time deposits	55,000	15,305,000
Marketable securities:
Marketable equity securities	11,076,000	1,065,000
Corporate debt securities	979,000	3,658,000
Total assets	17,782,000	21,340,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Cash equivalents:
U.S. Treasury bills	4,170,000
Money market mutual funds	1,502,000	1,257,000
Time deposits		15,305,000
Marketable securities:
Marketable equity securities	11,076,000
Corporate debt securities		3,658,000
Total assets	16,748,000	20,220,000
Significant Other Observable Inputs (Level 2)
Cash equivalents:
U.S. Treasury bills		55,000
Money market mutual funds
Time deposits	55,000
Marketable securities:
Marketable equity securities		1,065,000
Corporate debt securities	979,000
Total assets	1,034,000	1,120,000
Significant Unobservable Inputs (Level 3)
Cash equivalents:
U.S. Treasury bills
Money market mutual funds
Time deposits
Marketable securities:
Marketable equity securities
Corporate debt securities
Total assets