Note 11 - Accumulated Other Comprehensive Income (Loss) - AOCI Change (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Balance	$ 279,295	$ 267,301	$ 270,632
Other Comprehensive Income (Loss)	(8,279)	2,822	(28,117)
Balance	297,855	279,295	267,301
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(10,639)	(13,577)	10,535
Other comprehensive income (loss) before reclassifications	(8,594)	2,938	(24,112)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)
Other Comprehensive Income (Loss)	(8,594)	2,938	(24,112)
Balance	(19,233)	(10,639)	(13,577)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Balance	(82)	7	325
Other comprehensive income (loss) before reclassifications	(106)	(362)	(1,536)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)	(31)	273	1,218
Other Comprehensive Income (Loss)	(137)	(89)	(318)
Balance	(219)	(82)	7
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(9,545)	(9,518)	(5,831)
Other comprehensive income (loss) before reclassifications	196	(71)	(3,830)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)	256	44	143
Other Comprehensive Income (Loss)	452	(27)	(3,687)
Balance	(9,093)	(9,545)	(9,518)
AOCI Attributable to Parent [Member]
Balance	(20,266)	(23,088)	5,029
Other comprehensive income (loss) before reclassifications	(8,504)	2,505	(29,478)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)	225	317	1,361
Other Comprehensive Income (Loss)	(8,279)	2,822	(28,117)
Balance	$ (28,545)	$ (20,266)	$ (23,088)