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	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 1,903	$ 1,079	$ 4,679	$ 737
Inventories			(4,838)	(1,658)
Contract assets			$ (3,345)	(1,335)
Accounting Standards Update 2014-09 [Member]
Net income		1,079		737
Inventories				(1,658)
Contract assets				(1,335)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Net income		162		378
Inventories				957
Contract assets				(1,335)
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Net income		$ 917		359
Inventories				$ (2,615)