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
	Mar. 31, 2018	Feb. 28, 2018	Apr. 30, 2017	Mar. 31, 2016	Mar. 31, 2018	Mar. 31, 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				537,500	540,625	537,500	540,625
Weighted Average Remaining Contractual Life					6 years 9 months 11 days
Weighted Average Exercise Price	$ 2.19				$ 2.19	$ 2.18	$ 2.19	$ 2.18
Aggregate Intrinsic Value	$ 221,000				$ 221,000
Exercisable
Number Outstanding (Exercisable)	267,500				267,500	180,625
Weighted Average Exercise Price (Exercisable)	$ 2.71				$ 2.71	$ 3.29
Aggregate Intrinsic Value (Exercisable)	$ 88,000				$ 88,000
Additional disclosures
Stock based compensation expense					$ 10,000	$ 10,000
Period for recognizing unrecognized compensation cost					2 years 10 months 24 days
Stock Options \| January 21, 2009
Outstanding
Number Outstanding	7,500				7,500
Weighted Average Remaining Contractual Life					9 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					11 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 9 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 10 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					$ 26,000	$ 26,000
Unrecognized compensation cost, restricted stock	$ 13,000				$ 13,000
Period for recognizing unrecognized compensation cost					12 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					$ 32,000