Note 11 - Accumulated Other Comprehensive (Loss) - AOCI Change (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	$ (13,577)	$ 10,535	$ 2,982
Other comprehensive income (loss) before reclassifications	$ 2,938	$ (24,112)	$ 7,553
Net losses (gains) reclassified from accumulated other comprehensive income (loss)
Net current period other comprehensive income (loss)	$ 2,938	$ (24,112)	$ 7,553
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(10,639)	(13,577)	10,535
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	7	325	60
Other comprehensive income (loss) before reclassifications	(362)	(1,536)	361
Net losses (gains) reclassified from accumulated other comprehensive income (loss)	273	1,218	(96)
Net current period other comprehensive income (loss)	(89)	(318)	265
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(82)	7	325
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	(9,518)	(5,831)	(6,135)
Other comprehensive income (loss) before reclassifications	(71)	(3,830)	89
Net losses (gains) reclassified from accumulated other comprehensive income (loss)	44	143	215
Net current period other comprehensive income (loss)	(27)	(3,687)	304
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(9,545)	(9,518)	(5,831)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	(23,088)	5,029	(3,093)
Other comprehensive income (loss) before reclassifications	2,505	(29,478)	8,003
Net losses (gains) reclassified from accumulated other comprehensive income (loss)	317	1,361	119
Net current period other comprehensive income (loss)	2,822	(28,117)	8,122
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(20,266)	(23,088)	5,029
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	(23,088)
Net current period other comprehensive income (loss)	2,822	(28,117)	$ 8,122
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	$ (20,266)	$ (23,088)