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Note 10 - Segment Information (Tables)
 12 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    Chemical     Electronic     Engineering     Total  
Year ended March 31, 2019
                                
Revenue from customers
   $
1,318,814
     $
730,634
     $
969,506
     $
3,018,954
  
Segment operating income (loss)
   $
(81,849
 )   $
(403,099
 )   $
110,228
     $
(374,720
 )
                                 
Year ended March 31, 2018
                                
Revenue from customers
   $
1,391,522
     $
1,056,384
     $
1,306,306
     $
3,754,212
  
Segment operating income (loss)
   $
34,611
     $
(303,388
 )   $
202,589
     $
(66,188
 )
                                 
                                 
Total assets at March 31, 2019
   $
1,985,501
     $
1,099,983
     $
1,459,608
     $
4,545,092
  
                                 
Total assets at March 31, 2018
   $
1,687,276
     $
1,280,908
     $
1,583,950
     $
4,552,134