Common Stock Repurchase Plan - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Mar. 07, 2019	Sep. 17, 2002
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during the period	67,709	861,111
Purchase of treasury stock	$ 161,285	$ 1,970,632
Average cost per share repurchased (USD per share)	$ 2.38	$ 2.29
Treasury stock, shares	3,291,238	3,223,529
Total cost of shares repurchased	$ 3,440,104	$ 3,278,819
Total number of shares repurchased	3,291,238	3,223,529
2002 Common Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Average cost per share repurchased (USD per share)	$ 1.05
Stock repurchase plan, number of shares permitted			6,000,000
Remaining number of shares available to be repurchased			2,726,120
Treasury stock, shares	3,273,880
Total cost of shares repurchased	$ 3,421,383
Total number of shares repurchased	3,273,880
Stock Repurchase Programs Prior to 2002
Equity, Class of Treasury Stock [Line Items]
Treasury stock, shares				17,358
Total cost of shares repurchased				$ 18,720
Total number of shares repurchased				17,358