Stock-Based Compensation - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jul. 25, 2018	Dec. 31, 2018	Dec. 31, 2017	Jul. 24, 2018
2008 LTIP
Stock-based compensation
Shares authorized to be granted under stock compensation plan				2,000,000
2008 LTIP | Stock Options
Number Outstanding
Outstanding at beginning of year (in shares)		537,500	540,625
Forfeited or expired during the year (in shares)			(3,125)
Outstanding at end of year (in shares)		537,500	537,500
Exercisable at end of year (in shares)		267,500	177,500
Weighted Average Exercise Price
Outstanding at beginning of year (in dollars per share)		$ 2.19	$ 2.18
Forfeited or expired during the year (in dollars per share)			4.80
Outstanding at end of year (in dollars per share)		2.19	2.19
Exercisable at end of year (in dollars per share)		$ 2.71	$ 3.26
Additional disclosures
Stock based compensation expense (reversal of expense)		$ 39	$ 39
Unrecognized compensation cost, options		$ 84
Period for recognizing unrecognized compensation cost		2 years 1 month 24 days
2018 LTIP
Stock-based compensation
Contractual term of option awards	10 years
Number Outstanding
Granted during the year (in shares)		0
2018 LTIP | Stock Options
Number Outstanding
Granted during the year (in shares)		0	0
2018 LTIP | Maximum
Stock-based compensation
Shares available for awards	1,293,109