Note 1 - Nature of Business and Summary of Significant Accounting Policies - Disaggregated Revenues by Major Product Line (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Total revenues	$ 3,456,195	$ 2,436,592	$ 5,476,991	$ 4,739,003
Percent of revenues	100.00%	100.00%	100.00%	100.00%
System [Member]
Total revenues	$ 2,035,094	$ 907,727	$ 2,339,803	$ 1,723,308
Percent of revenues	58.90%	37.30%	42.70%	36.40%
Maintenance [Member]
Total revenues	$ 1,324,597	$ 1,242,177	$ 2,605,735	$ 2,449,173
Percent of revenues	38.40%	51.00%	47.60%	51.70%
Service and Other [Member]
Total revenues	$ 96,504	$ 286,688	$ 531,453	$ 566,522
Percent of revenues	2.70%	11.70%	9.70%	11.90%