Capital Stock (Narrative) (Details)							9 Months Ended	12 Months Ended
	Oct. 02, 2017 item shares	Jul. 03, 2017 item shares	Apr. 03, 2017 item shares	Mar. 17, 2017 $ / shares	Feb. 13, 2017 USD ($) shares	Jan. 04, 2017 item shares	Sep. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Mar. 16, 2017 $ / shares
Capital Stock [Line Items]
Common stock, par value | $ / shares							$ 0.001	$ 0.001
Preferred stock, shares authorized							25,000,000	25,000,000
Costs of stock issuance in rights offering | $							$ 102,000
Number of directors | item						4
Proceeds from stock issuance in rights offering | $							$ 2,699,000
Dividends conversion ratio							0.001
Exercise price | $ / shares									$ 1.10
Rights Plan [Member]
Capital Stock [Line Items]
Number of preferred share purchase right for each outstanding share of its common stock to shareholder | $ / shares				$ 1
Common stock, Threshold for exercise of rights percentage				4.95%
Rights [Member]
Capital Stock [Line Items]
Common stock, New shares issued					4,498,698
Costs of stock issuance in rights offering | $					$ 242,000			$ 140,000
Proceeds from stock issuance in rights offering | $					$ 2,700,000
Date declared							Mar. 17, 2017
Date to be paid							Mar. 27, 2017
Date of record							Mar. 16, 2017
Directors, CFO And Interim CEO [Member]
Capital Stock [Line Items]
Common stock, New shares issued		5,571	7,267			5,264
Number of directors | item		4	4
Directors, CFO And Interim CEO [Member] | Subsequent Event [Member]
Capital Stock [Line Items]
Common stock, New shares issued	5,401
Number of directors | item	4
Directors, Management, And Affiliates [Member] | Rights [Member]
Capital Stock [Line Items]
Common stock, New shares issued					3,293,407
Series A Preferred Stock [Member]
Capital Stock [Line Items]
Preferred stock, shares authorized							10,000	10,000
Preferred stock, shares issued							0	0
Series A Preferred Stock [Member] | Rights Plan [Member]
Capital Stock [Line Items]
Preferred stock, shares issued							0