Summary of Significant Accounting Policies - EPS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net earnings per common share - basic and diluted:
Net earnings	$ 520,000	$ 826,000	$ 1,077,000	$ 1,105,000
Allocation to nonvested restricted stock awards	13,000	19,000	27,000	27,000
Net earnings available to common stockholders	$ 507,000	$ 807,000	$ 1,050,000	$ 1,078,000
Weighted-average shares outstanding - basic and diluted	32,202,000	32,086,000	32,201,000	32,085,000
Net earnings per common share - basic and diluted	$ 0.02	$ 0.03	$ 0.03	$ 0.03
Options outstanding (in shares)	0	0	0	0
Dividends paid	$ 0	$ 0	$ 0	$ 0
Accounting for stock-based compensation
Stock-based compensation expense for restricted stock awards	75,000	90,000	252,000	285,000
Income tax benefit (expense) related to restricted stock awards	$ 31,000	$ 37,000	$ (16,000)	$ (56,000)