Note 6 - Disaggregated Revenues and Segment Information - Net Revenue, Classified by Geography (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 696,496	$ 983,162	$ 2,213,317	$ 3,044,838
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	656,467	896,866	1,975,147	2,806,986
UNITED STATES | Chemical [Member]
Revenue from Contract with Customer, Including Assessed Tax	175,402	245,582	598,176	811,596
UNITED STATES | Electronics [Member]
Revenue from Contract with Customer, Including Assessed Tax	423,593	485,454	1,082,634	1,584,003
UNITED STATES | Engineering [Member]
Revenue from Contract with Customer, Including Assessed Tax	57,472	165,830	294,337	411,387
Non-US [Member]
Revenue from Contract with Customer, Including Assessed Tax	40,029	86,296	238,170	237,852
Non-US [Member] | Chemical [Member]
Revenue from Contract with Customer, Including Assessed Tax	40,029	86,296	238,170	237,852
Non-US [Member] | Electronics [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Non-US [Member] | Engineering [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 0	$ 0	$ 0	$ 0