Note 18 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Balance	$ 1,466	$ 5,811
Other comprehensive loss before reclassifications	(5,656)	(4,340)
Amounts reclassified from accumulated other comprehensive income	(25)	(5)
Net current period other comprehensive loss	(5,681)	(4,345)	$ (449)
Balance	(4,215)	1,466	5,811
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Available-for-sale Securities [Member]
Balance	(375)	(196)
Other comprehensive loss before reclassifications	(623)	(174)
Amounts reclassified from accumulated other comprehensive income	(25)	(5)
Net current period other comprehensive loss	(648)	(179)
Balance	(1,023)	(375)	(196)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	1,841	6,007
Other comprehensive loss before reclassifications	(5,033)	(4,166)
Amounts reclassified from accumulated other comprehensive income
Net current period other comprehensive loss	(5,033)	(4,166)
Balance	$ (3,192)	$ 1,841	$ 6,007