The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

No definition available.

Stock-based Compensation - Options Outstanding and Exercisable (Details) - 2008 LTIP - USD ($)	1 Months Ended				3 Months Ended		6 Months Ended
	Mar. 31, 2018	Feb. 28, 2018	Apr. 30, 2017	Mar. 31, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Common Stock \| Directors
Additional disclosures
Shares issued for services	18,906		30,002
Stock based compensation expense related to shares issued for services	$ 45,000		$ 53,000
Stock Options
Outstanding
Number Outstanding					537,500	540,625	537,500	540,625	537,500	540,625
Weighted Average Remaining Contractual Life							6 years 6 months 11 days
Weighted Average Exercise Price					$ 2.19	$ 2.18	$ 2.19	$ 2.18	$ 2.19	$ 2.18
Aggregate Intrinsic Value					$ 261,000		$ 261,000
Exercisable
Number Outstanding (Exercisable)					267,500	180,625	267,500	180,625
Weighted Average Exercise Price (Exercisable)					$ 2.71	$ 3.29	$ 2.71	$ 3.29
Aggregate Intrinsic Value (Exercisable)					$ 104,000		$ 104,000
Additional disclosures
Stock based compensation expense					$ 10,000	$ 10,000	$ 19,000	$ 19,000
Period for recognizing unrecognized compensation cost							2 years 7 months 24 days
Stock Options \| January 21, 2009
Outstanding
Number Outstanding					7,500		7,500
Weighted Average Remaining Contractual Life							6 months 22 days
Weighted Average Exercise Price					$ 4.00		$ 4.00
Exercisable
Number Outstanding (Exercisable)					7,500		7,500
Weighted Average Exercise Price (Exercisable)					$ 4.00		$ 4.00
Stock Options \| March 18, 2009
Outstanding
Number Outstanding					75,000		75,000
Weighted Average Remaining Contractual Life							8 months 16 days
Weighted Average Exercise Price					$ 4.98		$ 4.98
Exercisable
Number Outstanding (Exercisable)					75,000		75,000
Weighted Average Exercise Price (Exercisable)					$ 4.98		$ 4.98
Stock Options \| January 21, 2010
Outstanding
Number Outstanding					5,000		5,000
Weighted Average Remaining Contractual Life							1 year 6 months 22 days
Weighted Average Exercise Price					$ 6.00		$ 6.00
Exercisable
Number Outstanding (Exercisable)					5,000		5,000
Weighted Average Exercise Price (Exercisable)					$ 6.00		$ 6.00
Stock Options \| February 24, 2016
Outstanding
Number Outstanding					450,000		450,000
Weighted Average Remaining Contractual Life							7 years 7 months 24 days
Weighted Average Exercise Price					$ 1.62		$ 1.62
Exercisable
Number Outstanding (Exercisable)					180,000		180,000
Weighted Average Exercise Price (Exercisable)					$ 1.62		$ 1.62
Restricted stock \| Chief Executive Officer
Additional disclosures
Restricted stock award (in shares)				120,483
Stock based compensation expense					$ 3,000	27,000	$ 30,000	53,000
Unrecognized compensation cost, restricted stock					10,000		$ 10,000
Period for recognizing unrecognized compensation cost							9 months
Restricted stock \| Two-year period \| Chief Executive Officer
Additional disclosures
Restricted stock award (in shares)				100,000
Vesting period of stock award				2 years
Restricted stock \| Three-year period \| Chief Executive Officer
Additional disclosures
Restricted stock award (in shares)				20,483
Vesting period of stock award				3 years
Cash-settled restricted stock units \| Chief Executive Officer
Additional disclosures
Restricted stock award (in shares)		97,195	129,270
Vesting period of stock award			2 years
Stock based compensation expense					$ 41,000	$ 23,000	$ 64,000	$ 23,000