Note 11 - Disaggregated Revenues and Segment Information - Net Revenue, Classified by Geography (Details) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue	$ 3,676,785	$ 3,206,594
Chemical [Member]
Revenue	1,258,890	1,319,578
Electronics [Member]
Revenue	1,883,251	1,405,594
Engineering [Member]
Revenue	534,644	481,422
UNITED STATES
Revenue	3,327,116	2,920,410
UNITED STATES | Chemical [Member]
Revenue	909,221	1,033,394
UNITED STATES | Electronics [Member]
Revenue	1,883,251	1,405,594
UNITED STATES | Engineering [Member]
Revenue	534,644	481,422
Non-US [Member]
Revenue	349,669	286,184
Non-US [Member] | Chemical [Member]
Revenue	349,669	286,184
Non-US [Member] | Electronics [Member]
Revenue	0	0
Non-US [Member] | Engineering [Member]
Revenue	$ 0	$ 0