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Shareholders' Equity - Stock Repurchase (Details) - USD ($)
 1 Months Ended 4 Months Ended 12 Months Ended 36 Months Ended
Jan. 11, 2017
Jan. 12, 2016
Aug. 31, 2018
Mar. 31, 2018
Jan. 31, 2018
Feb. 28, 2017
Jan. 31, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Aug. 16, 2017
Feb. 16, 2016
Equity, Class of Treasury Stock [Line Items]                            
Total Number of Shares Purchased (in shares) 2,363,590 2,136,752 1,377,325 102,000 165,000 448,000 867,507 381,607     6,548,473 14,390,254    
Average Price Paid per Share (in usd per share) $ 1.54 $ 1.35 $ 1.40 $ 1.41 $ 1.40 $ 1.48 $ 1.60 $ 1.41     $ 1.59 $ 1.52    
Amount $ 3,639,929 $ 2,884,615 $ 1,929,222 $ 143,820 $ 231,000 $ 662,356 $ 1,384,021 $ 537,661 $ 2,304,042 $ 6,223,967 $ 10,401,906 $ 21,814,530    
Maximum Dollar Value of Shares that May Yet Be Purchased Under the Plan     $ 2,158,297 $ 4,087,519 $ 4,231,339 $ 2,551,717 $ 3,214,073 $ 4,462,339   $ 4,462,339 $ 4,598,094   $ 5,000,000 $ 15,000,000
Publicly Announced Repurchase Plans [Member]                            
Equity, Class of Treasury Stock [Line Items]                            
Total Number of Shares Purchased (in shares) 2,363,590 0 1,377,325 102,000 165,000 448,000 867,507 381,607     6,548,473 12,253,502