Note 6 - Disaggregated Revenues and Segment Information - Net Revenue, Classified by Geography (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 983,162	$ 749,654	$ 3,044,838	$ 2,322,871
Chemical [Member]
Revenue from Contract with Customer, Including Assessed Tax	331,878	331,812	1,049,448	1,017,895
Electronics [Member]
Revenue from Contract with Customer, Including Assessed Tax	485,454	347,911	1,584,003	911,569
Engineering [Member]
Revenue from Contract with Customer, Including Assessed Tax	165,830	69,931	411,387	393,407
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	896,866	669,296	2,806,986	2,110,354
UNITED STATES | Chemical [Member]
Revenue from Contract with Customer, Including Assessed Tax	245,582	251,454	811,596	805,378
UNITED STATES | Electronics [Member]
Revenue from Contract with Customer, Including Assessed Tax	485,454	347,911	1,584,003	911,569
UNITED STATES | Engineering [Member]
Revenue from Contract with Customer, Including Assessed Tax	165,830	69,931	411,387	393,407
Non-US [Member]
Revenue from Contract with Customer, Including Assessed Tax	86,296	80,358	237,852	212,517
Non-US [Member] | Chemical [Member]
Revenue from Contract with Customer, Including Assessed Tax	86,296	80,358	237,852	212,517
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