Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	No Par, Common Stock	Accumulated deficit	Accumulated Other Comprehensive Income (Loss)	Private placement	Private placement No Par, Common Stock
Balance at beginning of period (in shares) at Dec. 31, 2016		7,633,070
Balance at beginning of period at Dec. 31, 2016	$ 67,794	$ 80,342	$ (11,468)	$ (1,080)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(2,866)		(2,866)
Restricted stock unit expense, net (in shares)		(1)
Restricted stock unit expense, net	466	$ 466
Other comprehensive income (loss)	573			573
Plus: cumulative effect of adoption of ASU No. 2018-02, net of taxes				0
Balance at end of period (in shares) at Jun. 30, 2017		7,633,069.000
Balance at end of period at Jun. 30, 2017	65,967	$ 80,808	(14,334)	(507)
Balance at beginning of period at Mar. 31, 2017				(746)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,067)
Other comprehensive income (loss)	239
Plus: cumulative effect of adoption of ASU No. 2018-02, net of taxes				0
Balance at end of period (in shares) at Jun. 30, 2017		7,633,069.000
Balance at end of period at Jun. 30, 2017	65,967	$ 80,808	(14,334)	(507)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(18,676)		(18,676)
Restricted stock unit expense, net (in shares)		87,259
Restricted stock unit expense, net	429	$ 429
Other comprehensive income (loss)	144			144
Issuance of common stock in private placement (in shares)						800,000
Issuance of common stock in private placement					$ 5,000	$ 5,000
Common stock issuance costs	(38)	$ (38)
Balance at end of period (in shares) at Dec. 31, 2017		8,520,328.000
Balance at end of period at Dec. 31, 2017	52,826	$ 86,199	(33,010)	(363)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASU No. 2016-01, net of taxes	0		556	(556)
Plus: cumulative effect of adoption of ASU No. 2018-02, net of taxes				77
Balance at end of period at Mar. 31, 2018				(2,688)
Balance at beginning of period (in shares) at Dec. 31, 2017		8,520,328.000
Balance at beginning of period at Dec. 31, 2017	52,826	$ 86,199	(33,010)	(363)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(900)
Restricted stock unit expense, net	460	$ 460
Other comprehensive income (loss)	(2,218)
Plus: cumulative effect of adoption of ASU No. 2018-02, net of taxes	0		77	77
Balance at end of period (in shares) at Jun. 30, 2018		8,520,328
Balance at end of period at Jun. 30, 2018	50,168	$ 86,659	(33,431)	(3,060)
Balance at beginning of period at Mar. 31, 2018				(2,688)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,113)
Other comprehensive income (loss)	(372)
Plus: cumulative effect of adoption of ASU No. 2018-02, net of taxes				0
Balance at end of period (in shares) at Jun. 30, 2018		8,520,328
Balance at end of period at Jun. 30, 2018	$ 50,168	$ 86,659	$ (33,431)	$ (3,060)