Annual report pursuant to Section 13 and 15(d)

Common Stock Repurchase Plan - Narrative (Details)

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Common Stock Repurchase Plan - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Mar. 07, 2019
Sep. 13, 2018
Sep. 16, 2002
Equity, Class of Treasury Stock [Line Items]          
Stock repurchased during the period 861,111        
Purchase of treasury stock $ 1,970,632 $ 0      
Total number of shares repurchased 3,223,529 2,362,418      
Total cost of shares repurchased $ 3,278,819 $ 1,308,187      
Average cost per share repurchased (usd per share) $ 2.29        
2002 Common Stock Repurchase Plan          
Equity, Class of Treasury Stock [Line Items]          
Stock repurchase plan, number of shares permitted       3,500,000  
Remaining number of shares available to be repurchased       293,829  
Total number of shares repurchased 3,206,171        
Total cost of shares repurchased $ 3,260,098        
Average cost per share repurchased (usd per share) $ 1.02        
Stock Repurchase Programs Prior to 2002          
Equity, Class of Treasury Stock [Line Items]          
Total number of shares repurchased         17,358
Total cost of shares repurchased         $ 18,720
Subsequent Event | 2002 Common Stock Repurchase Plan          
Equity, Class of Treasury Stock [Line Items]          
Total number of shares repurchased     3,273,880    
Subsequent Event | Revised Repurchase Plan          
Equity, Class of Treasury Stock [Line Items]          
Additional shares authorized for repurchase     2,500,000    
Remaining number of shares available to be repurchased     2,726,120