Note 13 - Accumulated Other Comprehensive Income (Loss) - AOCI Change (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	$ (20,266)
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(28,634)
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	(8,403)	534
Net (gain) loss reclassified from accumulated other comprehensive income (loss)
Net current period other comprehensive income (loss)	(8,403)	534
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(19,042)	(13,043)
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	66	(337)
Net (gain) loss reclassified from accumulated other comprehensive income (loss)	(31)	276
Net current period other comprehensive income (loss)	35	(61)
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(47)	(54)
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 (gain) 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	(8,337)	197
Net (gain) loss reclassified from accumulated other comprehensive income (loss)	(31)	276
Net current period other comprehensive income (loss)	(8,368)	473
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	$ (28,634)	$ (22,615)