Note 1 - Summary of Significant Accounting Policies - Disaggregated Revenues by Major Product Line (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Total revenues	$ 11,048,237	$ 11,164,026
Percent of revenues	100.00%	100.00%
System [Member]
Total revenues	$ 2,923,354	$ 4,090,263
Percent of revenues	26.50%	36.60%
Maintenance [Member]
Total revenues	$ 6,152,538	$ 5,378,620
Percent of revenues	55.70%	48.20%
Lease [Member]
Total revenues	$ 53,680	$ 0
Percent of revenues	0.50%	0.00%
Service and Other [Member]
Total revenues	$ 1,918,665	$ 1,695,143
Percent of revenues	17.40%	15.20%