Note 12 - Accumulated Other Comprehensive Income (Loss) - AOCI Change (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	$ (10,639)	$ (13,577)
Other comprehensive income (loss) before reclassifications	(2,825)	2,692
Net loss reclassified from accumulated other comprehensive income (loss)
Net current period other comprehensive income (loss)	(2,825)	2,692
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(13,464)	(10,885)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	(82)	7
Other comprehensive income (loss) before reclassifications	85	(117)
Net loss reclassified from accumulated other comprehensive income (loss)	90
Net current period other comprehensive income (loss)	175	(117)
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	93	(110)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	(9,545)	(9,518)
Other comprehensive income (loss) before reclassifications
Net loss reclassified from accumulated other comprehensive income (loss)
Net current period other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(9,545)	(9,518)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	(20,266)	(23,088)
Other comprehensive income (loss) before reclassifications	(2,740)	2,575
Net loss reclassified from accumulated other comprehensive income (loss)	90
Net current period other comprehensive income (loss)	(2,650)	2,575
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(22,916)	$ (20,513)
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	(20,266)
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	$ (22,916)