Note 13 - Accumulated Other Comprehensive Income (Details) - Changes in Accumulated Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 6,096	$ 5,811		$ 5,811
Other comprehensive income (loss) before reclassifications	93	286
Amounts reclassified from accumulated other comprehensive income	(3)	(1)
Net current period other comprehensive income (loss)	90	285	$ 188	375	$ (420)
Balance	6,186	6,096		6,186
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	6,256	6,007		6,007
Other comprehensive income (loss) before reclassifications	105	249
Net current period other comprehensive income (loss)	105	249
Balance	6,361	6,256		6,361
Available-for-sale Securities [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	16	(15)		(15)
Other comprehensive income (loss) before reclassifications	7	32
Amounts reclassified from accumulated other comprehensive income	(3)	(1)
Net current period other comprehensive income (loss)	4	31
Balance	20	16		20
Auction Rate Securities [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(176)	(181)		(181)
Other comprehensive income (loss) before reclassifications	(19)	5
Net current period other comprehensive income (loss)	(19)	5
Balance	$ (195)	$ (176)		$ (195)