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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Other Comprehensive Income (Loss)
Retained Earnings
Common stock outstanding, beginning (in shares) at Dec. 31, 2013   8,986,080      
Balance at the beginning of the period at Dec. 31, 2013 $ 70,335 $ 9 $ 41,311 $ 23 $ 28,992
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares)   234,432      
Exercise of stock options $ 1,337   1,337    
Stock repurchased (in shares) (272,767) (272,767)      
Stock repurchased $ (2,598)       (2,598)
Cash dividends, $.10 per share (914)       (914)
Stock issued - Sabine acquisition (in shares)   150,000      
Stock issued - Other 1,679   1,679    
Tax benefit - stock option exercises 211   211    
Stock-based compensation expense 401   401    
Employee stock purchase plan (in shares)   82      
Employee stock purchase plan 0   0    
Unrealized gain on available-for-sale securities, net of tax 14     14  
Foreign currency translation adjustment (45)     (45)  
Net income $ 5,596       5,596
Common stock outstanding, ending (in shares) at Dec. 31, 2014 9,097,827 9,097,827      
Balance at end of the period at Dec. 31, 2014 $ 76,016 $ 9 44,939 (8) 31,076
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares)   56,143      
Exercise of stock options 308   308    
Cash dividends, $.10 per share (1,417)       (1,417)
Stock issued - Other 155   155    
Tax benefit - stock option exercises 41   41    
Stock-based compensation expense 552   552    
Stock-based compensation - Dividend Equivalents (in shares)   15,005      
Stock-based compensation - Dividend Equivalents 265   265    
Stock-based compensation - ESPP 31   31    
Employee stock purchase plan (in shares)   14,982      
Employee stock purchase plan 31        
Unrealized gain on available-for-sale securities, net of tax (81)     (81)  
Foreign currency translation adjustment (77)     (77)  
Net income $ 6,776       6,776
Common stock outstanding, ending (in shares) at Dec. 31, 2015 9,183,957 9,183,957      
Balance at end of the period at Dec. 31, 2015 $ 82,569 $ 9 $ 46,291 $ (166) $ 36,435