Note 11 - Segment Reporting - Summary of Segment Activity (Details) - USD ($)	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Revenue	$ 4,011,519	$ 3,637,236
Net Loss	(2,389,503)	(3,746,424)
Segment assets	38,741,734		$ 40,125,655
Corporate, Non-Segment [Member]
Revenue	0	25,531
Water Segment [Member]
Revenue	1,434,919	592,990
Net Loss	(463,475)	(793,949)
Segment assets	8,285,608		7,781,211
Water Segment [Member] \| Operating Segments [Member]
Revenue	1,434,919	592,990
Ceramics Segment [Member]
Revenue	1,409,372	1,880,118
Net Loss	(561,684)	(1,056,348)
Segment assets	13,924,728		13,808,529
Ceramics Segment [Member] \| Operating Segments [Member]
Revenue	1,409,372	1,880,118
Plastic Products [Member]
Net Loss	(66,061)	(107,402)
Segment assets	1,272,322		1,099,019
Plastics Segment [Member]
Revenue	1,167,228	1,138,597
Plastics Segment [Member] \| Operating Segments [Member]
Revenue	1,167,228	1,138,597
Other Segments [Member]
Net Loss	(1,298,283)	$ (1,788,725)
Segment assets	$ 15,259,076		$ 17,436,896

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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