Significant Changes Due To Topic 606 (Summary of the Effects of Adoption of ASC Topic 606 on the Company's unaudited Consolidated Statement of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income (loss)	$ 5,547	$ 1,120	$ (5,100)
Inventories	(5,225)	(2,768)	1,087
Contract assets	(2,645)	(1,117)	1,082
Accrued Expenses	$ (710)	2,137	(545)
Accounting Standards Update 2014-09 [Member]
Net income (loss)		1,120	(5,100)
Inventories		(2,768)	1,087
Contract assets		(1,117)	1,082
Accrued Expenses		2,137
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Net income (loss)		256	(356)
Inventories		346	(726)
Contract assets		(1,117)	1,082
Accrued Expenses		515
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Net income (loss)		864	(4,744)
Inventories		(3,114)	$ 1,813
Accrued Expenses		$ 1,622