Shareholders' Equity - Repurchase Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Oct. 30, 2015	Dec. 03, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 204,000	$ 353,000
Stock Repurchase Plans
Repurchase of common stock, net	$ 312,000	$ 1,762,000
Common Stock [Member]
Stock Repurchase Plans
Repurchase of common stock, authorized			$ 5,000,000	$ 5,000,000
Repurchase of common stock, shares	128,000	664,000
Repurchase of common stock, net	$ 1,000	$ 7,000
Additional Paid In Capital [Member]
Stock Repurchase Plans
Repurchase of common stock, net	$ 311,000	$ 1,755,000
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percent of base compensation contributed towards purchase of shares	10.00%
Percent of market value for employee purchases	85.00%	85.00%
Employees purchased shares		18,000
Shares are reserved for future employee purchases	134,000
Stock-based compensation expense	$ 0	$ 16,000