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Note J - Geographic Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Reportable Geographical Components [Member] | UNITED STATES      
Net Sales $ 77,147 $ 131,198 $ 108,380
Long-lived Assets 37,319 40,822  
Reportable Geographical Components [Member] | ITALY      
Net Sales 13,294 14,457 17,396
Long-lived Assets 1,638 2,376  
Reportable Geographical Components [Member] | BELGIUM      
Long-lived Assets 7,154 6,709  
Reportable Geographical Components [Member] | AUSTRALIA      
Net Sales 9,943 10,454 9,955
Reportable Geographical Components [Member] | SWITZERLAND      
Long-lived Assets 7,145 7,686  
Reportable Geographical Components [Member] | CHINA      
Net Sales 9,019 19,712 33,830
Reportable Geographical Components [Member] | CANADA      
Net Sales 8,699 13,661 9,277
Reportable Geographical Components [Member] | Other Countries [Member]      
Net Sales 48,180 76,308 85,071
Long-lived Assets 2,477 2,586  
Net Sales 166,282 265,790 $ 263,909
Long-lived Assets $ 55,733 $ 60,179