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Note 22 - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Years ended December 31,
The components of accumulated other comprehensive loss, included in stockholders' equity, are as follows:
                  
   
2018
    
2017
    
                   
Net unrealized loss on available-for-sale securities
   $
(1,836,462
 )   $
(844,379
 )  
Net unrealized gain on interest rate swap instrument
    
1,271,538
      
567,704
    
     
(564,924
 )    
(276,675
 )  
                   
Tax effect
    
112,168
      
70,482
    
Net-of-tax amount
   $
(452,756
 )    
(206,193
 )