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Note 3 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   
December 31, 2019
   
December 31, 2018
 
Cash on consolidated balance sheet
  $
486,604
    $
1,645,481
 
Restricted cash
   
629,651
     
604,070
 
Total cash and restricted cash   $
1,116,255
    $
2,249,551
 
Point of Sale Equipment, Effect on Other Current Assets [Table Text Block]
   Balance December 31, 2017
 $                         515,000
Purchases during 2018
                            305,000
Amortization 2018
                          (295,000)
   Balance December 31, 2018
                            525,000
Purchases during 2019
                            272,000
Amortization 2019
                          (334,000)
   Balance December 31, 2019
 $                         463,000