Note 6 - Disaggregated Revenues and Segment Information - Net Revenue, Classified by Geography (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue from Contract with Customer, Including Assessed Tax	$ 887,498	$ 840,036	$ 1,861,173	$ 1,697,881
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	756,242	744,136	1,593,502	1,483,700
UNITED STATES | Chemical [Member]
Revenue from Contract with Customer, Including Assessed Tax	178,652	199,836	377,297	401,213
UNITED STATES | Electronics [Member]
Revenue from Contract with Customer, Including Assessed Tax	482,063	346,409	996,745	757,575
UNITED STATES | Engineering [Member]
Revenue from Contract with Customer, Including Assessed Tax	95,527	197,891	219,460	324,912
Non-US [Member]
Revenue from Contract with Customer, Including Assessed Tax	131,256	95,900	267,671	214,181
Non-US [Member] | Chemical [Member]
Revenue from Contract with Customer, Including Assessed Tax	131,256	95,900	267,671	214,181
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