Note 1 - Summary of Significant Accounting Policies (Details) - Net Sales from Significant Customers by Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Medical segment
Stryker (in Dollars)	$ 4,110	$ 3,968	$ 7,862	$ 7,620
Stryker [Member] | Medical [Member] | Sales Revenue, Segment [Member] | Customer Concentration Risk [Member]
Medical segment
Segement, concentration risk	11.00%	35.00%	13.00%	36.00%
Stryker [Member] | Medical [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Medical segment
Segement, concentration risk	9.00%	30.00%	11.00%	31.00%
Stryker [Member] | Medical [Member] | Customer Concentration Risk [Member]
Medical segment
Stryker (in Dollars)	362	1,201	840	2,346
Medical [Member]
Medical segment
Stryker (in Dollars)	$ 3,267	$ 3,399	$ 6,327	$ 6,428