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Stockholders' Equity and Employee Stock Option Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule Of Share Based Compensation Stock Options, RSU and SARS Activity [Table Text Block]
The following table summarizes stock award activity under all plans for the years ended December 31, 2017 and 2016:
 
 
 
 
Options Outstanding 
 
 
Shares Available for Grant 

 
Number Outstanding
 
Weighted-Average Exercise Price Per Share
BALANCE AT DECEMBER 31, 2015
 
517,505

 
285,536

 
$
24.72

New plan shares approved
 
750,000

 
—

 
—

Unissued shares eliminated from plan
 
(13,346
)
 
—

 
—

Options granted
 
(275,250
)
 
275,250

 
5.07

RSUs granted
 
(460,209
)
 
—

 
—

Options and stock appreciation rights cancelled
 
54,914

 
(54,914
)
 
25.50

RSUs cancelled
 
29,211

 
—

 
—

BALANCE AT DECEMBER 31, 2016
 
602,825

 
505,872

 
$
13.94

Options granted
 
(20,000
)
 
20,000

 
7.18

RSUs granted
 
(454,783
)
 
—

 
—

Options and stock appreciation rights cancelled
 
100,150

 
(100,150
)
 
23.92

RSUs cancelled
 
105,790

 
—

 
—

Balance at DECEMBER 31, 2017
 
333,982

 
425,722

 
$
11.28


The total intrinsic value of options and SARs exercised during the years ended December 31, 2017 and 2016 was approximately $0 and $0, respectively, as no options or SARs were exercised during this time. The intrinsic value is calculated as the difference between the market value on the date of exercise and the exercise price of the shares.
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table provides additional information regarding RSU and RSA activity for the years ended December 31, 2017 and 2016:
 
 
Number of Shares Nonvested and Outstanding
 
Weighted-Average Grant Date Fair-Value
BALANCE AT DECEMBER 31, 2015
 
64,714

 
$
14.45

RSUs granted
 
307,770

 
5.21

RSUs vested and released
 
(23,993
)
 
14.31

RSUs cancelled
 
(17,328
)
 
17.06

BALANCE AT DECEMBER 31, 2016
 
331,163

 
$
5.74

RSUs granted
 
454,783

 
4.88

RSUs vested and released
 
(136,928
)
 
6.22

RSUs cancelled
 
(93,112
)
 
5.31

BALANCE AT DECEMBER 31, 2017
 
555,906

 
$
4.99


The fair value of each RSU and RSA granted to employees was estimated on the date of grant by multiplying the number of shares granted times the fair market value of the Company's stock on the grant date.

The total intrinsic value of RSUs and RSAs vested and released during the years ended December 31, 2017 and 2016 was approximately $685,400 and $118,000, respectively. The intrinsic value of vested and released RSUs and RSAs is calculated by multiplying the fair market value of the Company's stock on the vesting date by the number of shares vested. As of December 31, 2017, the number of RSUs and RSAs outstanding was 555,906, with a total intrinsic value of $3.1 million. The intrinsic value of the outstanding RSUs and RSAs is calculated based on the market value of the Company's closing stock price of $5.54 as of December 29, 2017, the last market trading day of 2017.
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following table provides additional information for significant ranges of outstanding and exercisable stock options and SARs as of December 31, 2017:

Exercise
Price Range
 
Number
Outstanding
 
Weighted
Average
Remaining
Contractual Life
(in years)
 
 Weighted
Average
Exercise
Price per Share
 
 
Aggregate Intrinsic Value
$4.51
 
20,000

 
8.38
 
$
4.51

 
$
20,600

5.22
 
182,000

 
8.74
 
5.22

 
58,240

5.45 - 9.10
 
31,500

 
8.81
 
7.01

 
675

9.11
 
73,000

 
7.45
 
9.11

 
—

9.15 - 23.70
 
81,590

 
6.03
 
21.29

 
—

$24.20 - $32.50
 
37,632

 
4.77
 
30.24

 
—

Outstanding
 
425,722

 
7.64
 
$
11.28

 
$
79,515

Vested and expected to vest
 
418,607

 
7.64
 
$
11.35

 
$
77,790

Exercisable
 
345,103

 
7.43
 
$
12.41

 
$
57,168