Note 1 - Nature of Business and Summary of Significant Accounting Policies - Disaggregated Revenues by Major Product Line (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Total revenues	$ 9,486,853	$ 11,056,587
Percent of revenues	100.00%	100.00%
System [Member]
Total revenues	$ 3,330,158	$ 6,245,287
Percent of revenues	35.10%	56.60%
Maintenance [Member]
Total revenues	$ 4,985,415	$ 3,507,924
Percent of revenues	52.60%	31.70%
Lease [Member]
Total revenues	$ 0	$ 228,886
Percent of revenues	0.00%	2.10%
Service and Other [Member]
Total revenues	$ 1,171,280	$ 1,074,490
Percent of revenues	12.30%	9.60%