Note 11 - Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Marketable Securities [Table Text Block]

	December 31, 2014
	Amortized Cost		Gross Unrealized Gains/Losses			Estimated Fair Value
Available-for-sale:
Equity securities	$	41,462	$	46,197		$	87,659
Held-to-maturity:
Debt securities		2,576		(200	)		2,376
Total marketable securities	$	44,038	$	45,997		$	90,035

	December 31, 2013
	Amortized Cost		Gross Unrealized Gains		Estimated Fair Value
Available-for-sale:
Equity securities	$	33,728	$	25,995	$	59,723
Held-to-maturity:
Debt securities		3,043		59		3,102
Total marketable securities	$	36,771	$	26,054	$	62,825