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Note 12 - Quarterly Financial Data (Unaudited)
12 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
12.
     QUARTERLY FINANCIAL DATA (UNAUDITED)
 
The results of any single quarter are not necessarily indicative of the Company’s results for the full year. Earnings per share data is computed independently for each of the periods presented. As a result, the sum of the earnings per share amounts for the quarter may not equal the total for the year.
 
           
Quarter ended
         
2015
 
March 31,
   
June 30,
   
September 30,
   
December 31,
 
Revenue
  $ 19,876,566     $ 21,944,320     $ 26,790,881     $ 31,590,790  
Gross Profit
    3,602,071       3,848,369       5,596,432       3,554,831  
Net Income
    928,120       990,108       2,446,085       651,680  
Income per common share
                               
Basic
    0.11       0.12       0.29       0.08  
Diluted
    0.11       0.12       0.28       0.08  
                                 
2014
                               
Revenue
  $ 21,883,517     $ (23,751,623 )   $ 21,487,677     $ 20,067,439  
Gross Profit (loss)
    4,491,132       (42,963,154 )     4,471,304       4,276,019  
Net Income (loss)
    1,728,869       (29,691,951 )     1,697,547       1,056,260  
Income (loss) per common share
                               
Basic
    0.21       (3.50 )     0.20       0.20  
Diluted
    0.20       (3.50 )     0.20       0.20