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Stockholders' Equity (Narrative) (Details) - USD ($)
 12 Months Ended
Jul. 31, 2018
Jun. 01, 2018
Sep. 14, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2003
Class Of Stock [Line Items]                    
Common stock, shares authorized       300,000,000 300,000,000          
Common stock, par value       $ 0.01 $ 0.01          
Preferred stock, shares authorized       10,000,000 10,000,000          
Preferred stock, par value       $ 10.00 $ 10.00          
Options, Exercised (in shares)       173,130 10,000          
Issuance of restricted common stock (shares)       300,000            
Convertible Preferred Stock, Shares Issuable upon Conversion       The Company's Class N preferred shares, each of which is convertible to 40 common shares, have the right to receive dividends or dividend equivalents should the Company declare dividends on its common stock.            
Class N preferred shares, each convertible to common shares       40            
Class N preferred shares, conversion price per share       $ 1,000            
Term of Stock-Based Compensation Plan       3 years 2 months 15 days 6 years 9 months 18 days          
Exercise Price, Outstanding       $ 0.75 $ 0.97 $ 0.96        
Options to purchase, Granted (in shares)       526,500 50,000          
Exercise price, options granted in period       $ 0.43 $ 0.48          
Options, Expired       1,016,870 0          
Stock-based compensation expense       $ 289,000 $ 246,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares       1,770,200 2,368,113          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value       $ 0.31 $ 0.31          
Unrecognized stock-based compensation       $ 700,000            
Unrecognized stock-based compensation, Period for recognition       2 years 9 months 18 days            
Fair Value of Options Vested in Period       $ 300,000 $ 300,000          
Aggregate intrinsic value of exercisable options       11,000 1,000          
Other Options Issued [Member]                    
Class Of Stock [Line Items]                    
Stock Option Award Vesting Period             4 years      
Options to purchase, Granted (in shares)             625,000      
Exercise price, options granted in period             $ 2.00      
Stock Options [Member] | Selling, General and Administrative Expenses [Member]                    
Class Of Stock [Line Items]                    
Stock-based compensation expense       $ 300,000 200,000          
Restricted Stock [Member]                    
Class Of Stock [Line Items]                    
Stock-based compensation expense         $ 4,000          
Number of restricted shares awarded to each employee       150,000            
Vested balance of restricted stock awards         262,500          
Unrecognized stock-based compensation expense       $ 200,000            
Employees | NLEX [Member]                    
Class Of Stock [Line Items]                    
Options, Exercised (in shares)       173,130            
Options to purchase, Granted (in shares)   300,000                
Options, Expired 126,870                  
2003 Stock Option and Appreciation Rights Plan [Member]                    
Class Of Stock [Line Items]                    
Options, Exercised (in shares)       0 10,000          
Number of Shares Authorized for Stock-Based Compensation Plan                   2,000,000
Term of Stock-Based Compensation Plan                   10 years
Stock Option Award Vesting Period                   4 years
Options to purchase, Granted (in shares)       0            
Options, Expired       660,000 0          
2003 Stock Option and Appreciation Rights Plan [Member] | Minimum [Member]                    
Class Of Stock [Line Items]                    
Exercise Price, Outstanding                   $ 1.00
2003 Stock Option and Appreciation Rights Plan [Member] | Maximum [Member]                    
Class Of Stock [Line Items]                    
Exercise Price, Outstanding                   $ 2.00
2010 Non-Qualified Stock Option Plan [Member]                    
Class Of Stock [Line Items]                    
Number of Shares Authorized for Stock-Based Compensation Plan                 1,250,000  
Stock Option Award Vesting Period                 4 years  
Options to purchase, Granted (in shares)       85,000 50,000          
2010 Non-Qualified Stock Option Plan [Member] | Directors [Member] | Annual Compensation [Member]                    
Class Of Stock [Line Items]                    
Options to purchase, Granted (in shares)       85,000 50,000 70,000        
2010 Non-Qualified Stock Option Plan [Member] | Directors [Member] | Special Grant to Directors [Member]                    
Class Of Stock [Line Items]                    
Options to purchase, Granted (in shares)           125,000        
2010 Non-Qualified Stock Option Plan [Member] | Officer [Member] | Special Grant to Employee Base [Member]                    
Class Of Stock [Line Items]                    
Options to purchase, Granted (in shares)           525,000        
2010 Non-Qualified Stock Option Plan [Member] | Minimum [Member]                    
Class Of Stock [Line Items]                    
Exercise Price, Outstanding                 $ 0.24  
2010 Non-Qualified Stock Option Plan [Member] | Maximum [Member]                    
Class Of Stock [Line Items]                    
Exercise Price, Outstanding                 $ 0.70  
Equity Partners Stock Option Plan [Member]                    
Class Of Stock [Line Items]                    
Number of Shares Authorized for Stock-Based Compensation Plan               230,000    
Options to purchase, Granted (in shares)               230,000    
Exercise price, options granted in period               $ 1.83    
Options, Expired       230,000 0          
2016 Stock Option Plan [Member]                    
Class Of Stock [Line Items]                    
Options, Exercised (in shares)       173,130 0          
Number of Shares Authorized for Stock-Based Compensation Plan     3,150,000              
Stock Option Award Vesting Period     4 years              
Exercise Price, Outstanding     $ 0.45              
Options to purchase, Granted (in shares)       441,500 0 2,539,200        
Options, Expired       126,870 0          
Preferred Stock [Member]                    
Class Of Stock [Line Items]                    
Convertible Preferred Stock, Shares Issuable upon Conversion       Each Class N preferred share has a voting entitlement equal to 40 common shares, votes with the common stock on an as-converted basis and is senior to all other preferred stock of the Company. Dividends, if any, will be paid on an as-converted basis equal to common stock dividends. The conversion value of each Class N preferred share is $1,000, and each share is convertible to 40 common shares at the rate of $25.00 per common share. The Class N preferred stockholders are entitled to liquidation preference over common stockholders equivalent to $1,000 per share.            
Conversion of class N preferred stock to shares of common stock       0 0          
Common Stock [Member]                    
Class Of Stock [Line Items]                    
Options, Exercised (in shares)       173,130 10,000          
Issuance of restricted common stock (shares)       600,000            
Share price       $ 25.00            
Class N preferred stockholders to liquidation preference, conversion price per share       $ 1,000            
David Ludwig And Tom Ludwig [Member]                    
Class Of Stock [Line Items]                    
Issuance of restricted common stock (shares)   600,000                
David Ludwig And Tom Ludwig [Member] | Restricted Stock [Member]                    
Class Of Stock [Line Items]                    
Stock-based compensation expense       $ 30,000            
Shares restriction term of service   5 years                
Weighted average grant date fair value       $ 0.43