Note 11 - Accumulated Other Comprehensive (Loss) - AOCI Reclass (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Mar. 31, 2016	[1]	Dec. 31, 2015	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Other income (expense), net													$ (1)	$ 30	$ 155
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]
Other income (expense), net													(454)	(1,903)	(7)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Cost of goods sold													(437)	(179)	(236)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Income before income tax provision													(892)	(2,052)	(88)
Tax impact													575	691	(31)
Total reclassifications for the year													(317)	(1,361)	(119)
Other income (expense), net													(915)	4,077	(1,941)
Cost of goods sold													217,451	236,802	236,120
Income before income tax provision													23,489	30,430	13,459
Tax impact													(8,748)	(6,690)	(7,413)
Total reclassifications for the year	$ 6,197		$ 2,286		$ 3,273		$ 2,985		$ 7,796	$ 6,622	$ 5,747	$ 3,575	$ 14,741	$ 23,740	$ 6,046

[1] During the fiscal year ended March 31, 2016, we recorded out-of-period adjustments that increased the income tax provision by a net amount of $1.4 million. See Note 16, ""Income Taxes"" in the Notes to Consolidated Financial Statements in Item 8 of this Annual Report on Form 10-K for further discussion of an out-of-period adjustment during the quarter ended December 31, 2015.