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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2013 $ 9 $ 41,311 $ 23 $ 28,992 $ 70,335
Balance, shares at Dec. 31, 2013 8,986,080        
Exercise of stock options 1,337 $ 1,337
Exercise of stock options, shares 234,432       (234,432)
Stock repurchased (2,598) $ (2,598)
Stock repurchased, shares (272,767)        
Cash dividends, per share (914) (914)
Stock issued - Sabine acquisition 1,679 1,679
Stock issued - Sabine acquisition, shares 150,000        
Tax benefit - stock option exercises 211 211
Stock-based compensation expense 401 401
Stock-based compensation expense, shares        
Proceeds from employee stock purchase plan
Proceeds from employee stock purchase plan, shares 82        
Unrealized gain on available-for-sale securities, net of tax 14 14
Foreign currency translation adjustment (45) (45)
Net income 5,596 5,596
Balance at Dec. 31, 2014 $ 9 44,939 (8) 31,076 76,016
Balance, shares at Dec. 31, 2014 9,097,827        
Exercise of stock options 308 $ 308
Exercise of stock options, shares 56,143       (56,143)
Cash dividends, per share (1,417) $ (1,417)
Stock issued - Sabine acquisition        
Tax benefit - stock option exercises 41 41
Stock-based compensation expense 848 848
Stock-based compensation expense, shares 15,005        
Proceeds from employee stock purchase plan 155 155
Proceeds from employee stock purchase plan, shares 14,982        
Unrealized gain on available-for-sale securities, net of tax (81) (81)
Foreign currency translation adjustment (77) (77)
Net income 6,776 6,776
Balance at Dec. 31, 2015 $ 9 46,291 (166) 36,435 $ 82,569
Balance, shares at Dec. 31, 2015 9,183,957       9,183,957
Exercise of stock options 686 $ 686
Exercise of stock options, shares 149,315       (374,857)
Stock repurchased (6,086) $ (6,086)
Stock repurchased, shares (542,259)        
Cash dividends, per share (1,817) (1,817)
Stock issued - Sabine acquisition        
Tax benefit - stock option exercises 690 690
Stock-based compensation expense 667 667
Stock-based compensation expense, shares 12,491        
Proceeds from employee stock purchase plan 87 87
Proceeds from employee stock purchase plan, shares 9,140        
Unrealized gain on available-for-sale securities, net of tax (1) (1)
Foreign currency translation adjustment (38) (38)
Options repurchased (1,752) (1,752)
Net income 2,444 2,444
Balance at Dec. 31, 2016 $ 9 $ 46,669 $ (205) $ 30,976 $ 77,449
Balance, shares at Dec. 31, 2016 8,812,644       8,812,644