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Note 7 - Property and Equipment
12 Months Ended
Mar. 31, 2018
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
7.
Property and Equipment:
 
 
   
Fiscal Year Ended March 31,
 
   
2017
   
2018
 
Land
  $
32,839
    $
43,209
 
Buildings and improvements
   
307,098
     
393,247
 
Machinery and equipment
   
1,150,999
     
1,470,460
 
Construction in progress
   
38,315
     
73,572
 
     
1,529,251
     
1,980,488
 
Accumulated depreciation
   
(1,289,300
)    
(1,562,202
)
    $
239,951
    $
418,286