Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member] Series A	Common Stock [Member] Series B	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock Series A	Treasury Stock	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Series A	Total
Beginning Balance at Dec. 31, 2017			$ 232	$ 494,989		$ (11,302)	$ (24,932)	$ (361,288)		$ 97,699
Beginning Balance, Shares Common Stock at Dec. 31, 2017	20,700,292	2,469,755
Beginning Balance, Treasury Stock at Dec. 31, 2017					(1,430,961)
Net Loss								(4,014)		(4,014)
Other comprehensive income							158			158
Shares repurchased, shares					(108,778)
Shares repurchased						(555)				(555)
Issuance of shares for restricted stock units, shares	117,102
Issuance of shares for restricted stock units			1	(1)
Share-based compensation				617						617
Conversion of Series B to Series A, shares	120	(120)
Dividends declared								(1,781)		(1,781)
Ending Balance at Mar. 31, 2018			233	495,605		(11,857)	(24,774)	(367,083)		92,124
Ending Balance, Shares Common Stock at Mar. 31, 2018	20,817,514	2,469,635
Ending Balance, Shares Treasury Stock at Mar. 31, 2018					(1,539,739)
Beginning Balance at Dec. 31, 2018			233	494,389		(12,601)	(37,641)	(393,582)		50,798
Beginning Balance, Shares Common Stock at Dec. 31, 2018	20,854,728	2,469,555
Beginning Balance, Treasury Stock at Dec. 31, 2018					(1,697,370)
Net Loss								(2,135)		(2,135)
Other comprehensive income							63			63
Shares repurchased, shares					(83,529)				(83,529)
Shares repurchased						(340)			$ (340)	(340)
Conversion of Series B to Series A, shares	11	(11)
Dividends declared								(1,720)		(1,720)
Ending Balance at Mar. 31, 2019			$ 233	$ 494,389		$ (12,941)	$ (37,578)	$ (397,437)		$ 46,666
Ending Balance, Shares Common Stock at Mar. 31, 2019	20,854,739	2,469,544
Ending Balance, Shares Treasury Stock at Mar. 31, 2019					(1,780,899)