Note 11 - Accumulated Other Comprehensive (Loss) - AOCI Change (Details) - USD ($)	6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	$ (13,577,000)	$ 10,535,000
Other comprehensive income (loss) before reclassifications	$ 3,561,000	$ (8,100,000)
Net (gain) loss reclassified from accumulated other comprehensive income (loss)
Net current period other comprehensive income (loss)	$ 3,561,000	$ (8,100,000)
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(10,016,000)	2,435,000
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	7,000	325,000
Other comprehensive income (loss) before reclassifications	(302,000)	(638,000)
Net (gain) loss reclassified from accumulated other comprehensive income (loss)	272,000	(19,000)
Net current period other comprehensive income (loss)	(30,000)	(657,000)
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(23,000)	(332,000)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	(9,518,000)	$ (5,831,000)
Other comprehensive income (loss) before reclassifications	$ 0
Net (gain) loss reclassified from accumulated other comprehensive income (loss)
Net current period other comprehensive income (loss)	$ 0
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(9,518,000)	$ (5,831,000)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	(23,088,000)	5,029,000
Other comprehensive income (loss) before reclassifications	3,259,000	(8,738,000)
Net (gain) loss reclassified from accumulated other comprehensive income (loss)	272,000	(19,000)
Net current period other comprehensive income (loss)	3,531,000	(8,757,000)
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	(19,557,000)	$ (3,728,000)
Accumulated Other Comprehensive Income (Loss) Net Of Tax, Beginning of Period	(23,088,000)
Accumulated Other Comprehensive Income (Loss) Net Of Tax, End of Period	$ (19,557,000)