Note 6 - Disaggregated Revenues and Segment Information - Net Revenue, Classified by Geography (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Revenue from Contract with Customer, Including Assessed Tax	$ 749,510	$ 696,496	$ 2,447,391	$ 2,213,317
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	680,708	656,467	2,164,407	1,975,147
UNITED STATES | Chemical [Member]
Revenue from Contract with Customer, Including Assessed Tax	213,449	175,402	614,661	598,176
UNITED STATES | Electronics [Member]
Revenue from Contract with Customer, Including Assessed Tax	351,532	423,593	1,109,107	1,082,634
UNITED STATES | Engineering [Member]
Revenue from Contract with Customer, Including Assessed Tax	115,727	57,472	440,639	294,337
Non-US [Member]
Revenue from Contract with Customer, Including Assessed Tax	68,802	40,029	282,984	238,170
Non-US [Member] | Chemical [Member]
Revenue from Contract with Customer, Including Assessed Tax	68,802	40,029	282,984	238,170
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