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Property, Plant and Equipment (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Details            
Schedule of Property, Plant and Equipment 4,751 4,727    

(in thousands)

December 31, 2018

(unaudited)

March 31, 2018

Land

   $                  500 

   $                     500 

Building

                    2,705 

                       2,705 

Machinery, equipment and tooling

                    1,248 

                       1,224 

Furniture, fixtures and office equipment

                       285 

                          285 

Office equipment under capital lease

                         13 

                            13 

                    4,751 

                       4,727 

Less:  accumulated depreciation

                     2,946

                        2,904

 

   $              1,805 

   $              1,823 
 
Land $ 500 $ 500 $ 500   $ 500  
Buildings and Improvements, Gross 2,705 2,705 2,705   2,705  
Machinery and Equipment, Gross 1,248 1,224 1,248   1,248  
Furniture and Fixtures, Gross 285 285 285   285  
Debt and Capital Lease Obligations 13 13 13   13  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 2,946 2,904 2,946   2,946  
Property, plant and equipment, net $ 1,805,000 $ 1,823,000 1,805,000   1,805,000  
Depreciation     $ 14,000 $ 13,000 $ 43,000 $ 38,000