Note 1 - Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue	$ 4,990,019	$ 5,018,292	$ 9,001,538	$ 8,655,528
Water Segment [Member]
Revenue, Percentage	2070298.00%	2144011.00%
Revenue			3,505,217	2,737,002
Ceramics Segment [Member]
Revenue, Percentage	1789465.00%	1812334.00%
Revenue			3,198,837	3,692,452
Plastics Segment [Member]
Revenue, Percentage	1127455.00%	1035705.00%
Revenue			2,294,683	2,174,302
Corporate Segment [Member]
Revenue, Percentage	2801.00%	26242.00%
Revenue			$ 2,801	$ 51,772