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Note 6 - Disaggregated Revenues and Segment Information - Net Revenue, Classified by Geography (Details) - USD ($)
3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax $ 921,408 $ 721,358
Chemical [Member]    
Revenue from Contract with Customer, Including Assessed Tax 372,175 315,257
Electronics [Member]    
Revenue from Contract with Customer, Including Assessed Tax 464,692 222,574
Engineering [Member]    
Revenue from Contract with Customer, Including Assessed Tax 84,541 183,527
UNITED STATES    
Revenue from Contract with Customer, Including Assessed Tax 796,133 639,405
UNITED STATES | Chemical [Member]    
Revenue from Contract with Customer, Including Assessed Tax 246,900 233,304
UNITED STATES | Electronics [Member]    
Revenue from Contract with Customer, Including Assessed Tax 475,492 222,574
UNITED STATES | Engineering [Member]    
Revenue from Contract with Customer, Including Assessed Tax 73,741 183,527
Non-US [Member]    
Revenue from Contract with Customer, Including Assessed Tax 125,275 81,953
Non-US [Member] | Chemical [Member]    
Revenue from Contract with Customer, Including Assessed Tax 125,275 81,953
Non-US [Member] | Electronics [Member]    
Revenue from Contract with Customer, Including Assessed Tax 0 0
Non-US [Member] | Engineering [Member]    
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0