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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Total revenues $ 1,447,046 $ 1,133,071 $ 3,624,019 $ 2,258,701
Percent of revenues 100.00% 100.00% 100.00% 100.00%
System [Member]        
Total revenues $ 481,418 $ 472,238 $ 1,555,401 $ 854,624
Percent of revenues 33.30% 41.70% 42.90% 48.10%
Maintenance [Member]        
Total revenues $ 857,814 $ 603,648 $ 1,641,506 $ 1,314,475
Percent of revenues 59.30% 53.30% 45.30% 49.10%
Lease [Member]        
Total revenues $ 0 $ 0 $ 212,658 $ 0
Percent of revenues 0.00% 0.00% 5.90% 0.00%
Service and Other [Member]        
Total revenues $ 107,814 $ 57,185 $ 214,454 $ 89,602
Percent of revenues 7.40% 5.00% 5.90% 2.80%