Note 17 - Accumulated Other Comprehensive Income (Details) - Changes in Accumulated Other Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2014	$ 5,811	$ 6,260
Balance	1,466	5,811	$ 6,260
Other comprehensive income (loss) before reclassifications	(4,340)	(447)
Amounts reclassified from accumulated other comprehensive income	(5)	(2)
Net current period other comprehensive income (loss)	(4,345)	(449)	2,085
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2014	6,007	6,616
Balance	1,841	6,007	6,616
Other comprehensive income (loss) before reclassifications	(4,166)	(609)
Net current period other comprehensive income (loss)	(4,166)	(609)
Available-for-sale Securities [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2014	(15)	4
Balance	(166)	(15)	4
Other comprehensive income (loss) before reclassifications	(146)	(17)
Amounts reclassified from accumulated other comprehensive income	(5)	(2)
Net current period other comprehensive income (loss)	(151)	(19)
Auction Rate Securities [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2014	(181)	(360)
Balance	(209)	(181)	$ (360)
Other comprehensive income (loss) before reclassifications	(28)	179
Net current period other comprehensive income (loss)	$ (28)	$ 179