Summary of Significant Accounting Policies - EPS (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net earnings (loss) per common share - basic and diluted:
Net earnings (loss)									$ 786,000	$ 1,873,000	$ (706,000)
Allocation to nonvested restricted stock awards									20,000	44,000
Net earnings (loss) available to common stockholders									$ 766,000	$ 1,829,000	$ (706,000)
Weighted-average shares outstanding									32,201,000	32,085,000	31,961,000
Net earnings (loss) per share-basic and diluted	$ (0.01)	$ 0.02	$ 0.02	$ (0.01)	$ 0.02	$ 0.03	$ 0.02	$ (0.01)	$ 0.02	$ 0.06	$ (0.02)
Anti-dilutive securities not included in the computation of diluted EPS (in shares)									0	0	0
Dividends paid									$ 0	$ 0	$ 0
Nonvested restricted stock
Accounting for stock-based compensation
Stock-based compensation expense for restricted stock awards									326,000	375,000	580,000
Income tax benefit (expense) related to vesting of restricted stock awards									$ 14,000	$ (20,000)	$ 51,000