Note 13 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Mar. 31, 2017
Balance		$ 431,116
Balance	$ 473,793
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Balance	(821)	(1,023)
Other comprehensive income before reclassifications	144	202
Amounts reclassified from accumulated other comprehensive loss	(3)
Net current period other comprehensive income	141	202
Balance	(680)	(821)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(1,886)	(3,192)
Other comprehensive income before reclassifications	1,186	1,306
Amounts reclassified from accumulated other comprehensive loss
Net current period other comprehensive income	1,186	1,306
Balance	(700)	(1,886)
AOCI Attributable to Parent [Member]
Balance	(2,707)	(4,215)
Other comprehensive income before reclassifications	1,330	1,508
Amounts reclassified from accumulated other comprehensive loss	(3)
Net current period other comprehensive income	1,327	1,508
Balance	$ (1,380)	$ (2,707)