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Note 11 - Disaggregated Revenues and Segment Information - Net Revenue, Classified by Geography (Details) - USD ($)
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenue $ 2,965,406 $ 3,676,785
Chemical [Member]    
Revenue 1,101,016 1,258,890
Electronics [Member]    
Revenue 1,512,692 1,883,251
Engineering [Member]    
Revenue 351,698 534,644
UNITED STATES    
Revenue 2,652,700 3,327,116
UNITED STATES | Chemical [Member]    
Revenue 788,310 909,221
UNITED STATES | Electronics [Member]    
Revenue 1,512,692 1,883,251
UNITED STATES | Engineering [Member]    
Revenue 351,698 534,644
Non-US [Member]    
Revenue 312,706 349,669
Non-US [Member] | Chemical [Member]    
Revenue 312,706 349,669
Non-US [Member] | Electronics [Member]    
Revenue 0 0
Non-US [Member] | Engineering [Member]    
Revenue $ 0 $ 0