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Stockholders' Equity - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 14, 2016
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
$ / shares
Dec. 31, 2013
$ / shares
Jun. 30, 2017
$ / shares
shares
Mar. 31, 2017
$ / shares
Dec. 31, 2016
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
Jun. 30, 2016
$ / shares
shares
Mar. 31, 2016
$ / shares
Dec. 31, 2015
$ / shares
 [2]
Sep. 30, 2015
$ / shares
Mar. 31, 2015
$ / shares
Jun. 30, 2017
USD ($)
increase
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
May 31, 2015
USD ($)
Class of Stock [Line Items]                                  
Common stock, outstanding shares (in shares) | shares         33,087,308       32,907,863         33,087,308 32,907,863    
Cash dividends paid (per common share) | $ / shares     $ 0.065 $ 0.10 $ 0.07 $ 0.07 $ 0.065 $ 0.05 $ 0.05 [1] $ 0.05 $ 0.05 $ 0.05 $ 0.05        
Number of increases to quarterly cash dividend | increase                           2      
Cash dividends paid to common stockholders                           $ 8,432,435 $ 6,565,823 $ 9,833,642  
Redemption of preferred shares                           7,932,975 0 0  
Cash dividends to preferred stockholders                           $ 250,990 $ 674,302 $ 674,302  
Series A Cumulative Preferred Stock                                  
Class of Stock [Line Items]                                  
Preferred stock dividend rate (as a percent)                           8.50%    
Preferred stock, liquidation preference (in dollars per share) | $ / shares               $ 25.00         $ 25.00    
Common Stock                                  
Class of Stock [Line Items]                                  
Purchases of treasury stock (in shares) | shares                           83,675 16,292 7,535  
Treasury stock acquired, average cost (in dollars per share) | $ / shares                           $ 6.42 $ 5.49 $ 9.16  
Purchases of treasury stock                           $ 537,014 $ 89,503 $ 69,015  
Percentage of cash dividends treated as qualified dividend income                               14.00%  
Percentage of cash dividends treated as return of capital                               86.00%  
Preferred                                  
Class of Stock [Line Items]                                  
Percentage of cash dividends treated as qualified dividend income                               100.00%  
Preferred | Series A Cumulative Preferred Stock                                  
Class of Stock [Line Items]                                  
Issuance of preferred stock (in shares) | shares   317,319                              
Preferred stock dividend rate (as a percent)   8.50%                              
Preferred stock, liquidation preference (in dollars per share) | $ / shares   $ 25.00           $ 25.00                  
Redemption of preferred shares $ 7,932,975                                
Preferred stock deemed dividend   $ 1,002,440           $ 1,002,440                  
Cash dividends to preferred stockholders                           $ 250,990 $ 674,302 $ 674,302  
2015 Share Repurchase Program | Common Stock                                  
Class of Stock [Line Items]                                  
Amount authorized to be repurchased                                 $ 5,000,000
Purchases of treasury stock (in shares) | shares                           265,762 202,390 63,372  
Treasury stock acquired, average cost (in dollars per share) | $ / shares                           $ 6.05 $ 5.80 $ 6.87  
Purchases of treasury stock                           $ 1,609,008 $ 1,173,899 $ 435,109  
[1] Includes gain on settlement of Delhi field litigation of $28.1 million.
[2] Includes $1.3 million restructuring charge.