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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
  

For the Years ended December 31,

 
  

2022

  

2021

 
  

% Revenues

  

% AR

  

% Revenues

  

% AR

 

Major

  31.7%  33.7%  0.0%  50.2%

All Others

  68.3%  66.3%  100.0%  49.8%

Total

  100.0%  100.0%  100.0%  100.0%
Disaggregation of Revenue [Table Text Block]
  

Years ended December 31,

 
  

2022

  

2021

  

2022

  

2021

 
          (percent of revenues) 

System revenue

 $6,245,287  $3,074,393   56.5%  44.1%

Maintenance revenue

  3,507,924   3,121,283   31.7%  44.8%

Lease revenue

  228,886   212,658   2.1%  3.1%

Service and other revenue

  1,074,490   558,349   9.6%  8.0%

Total revenues

 $11,056,587  $6,966,683   100.0%  100.0%