Note 1 - Summary of Significant Accounting Policies - Disaggregated Revenues by Major Product Line (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Total revenues	$ 3,914,339	$ 3,535,933
Percent of revenues	100.00%	100.00%
System [Member]
Total revenues	$ 1,736,561	$ 1,561,903
Percent of revenues	44.40%	44.20%
Maintenance [Member]
Total revenues	$ 1,541,403	$ 1,509,782
Percent of revenues	39.30%	42.70%
Service and Other [Member]
Total revenues	$ 636,375	$ 464,248
Percent of revenues	16.30%	13.10%