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Note 16 - New Accounting Pronouncements (Tables)
 3 Months Ended
Jun. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
In the following table, revenue is disaggregated by revenue category.

   

For the Three Months Ended

June 30, 2018

  
   

Commercial

    

Government

  

Sales Distribution

               
                 

Test Units

   $ 334,232     $ 1,092,582  

Repairs and Calibration

     332,699       -  

Replacement Parts

     45,768       -  

Extended Warranty

     8,933       -  
    $ 721,632     $ 1,092,582