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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Treasury Stock [Member]
Total
Balance (in shares) at Dec. 31, 2017 20,745,041       1,480,101  
Balance at Dec. 31, 2017 $ 207 $ 93,127 $ 28,333 $ (2,289) $ (9,608) $ 109,770
Net income 3,853 3,853
Other comprehensive income 283 283
Issuance of common stock for stock options exercised (in shares) 34,826        
Issuance of common stock for stock options exercised $ 1 292 293
Stock-based compensation expense 621 621
Repurchase of common stock at cost (in shares)        
Repurchase of common stock at cost
Common stock dividend accrued (1,350) (1,350)
Balance (in shares) at Mar. 31, 2018 20,779,867       1,480,101  
Balance at Mar. 31, 2018 $ 208 94,040 30,836 (2,006) $ (9,608) 113,470
Balance (in shares) at Dec. 31, 2017 20,745,041       1,480,101  
Balance at Dec. 31, 2017 $ 207 93,127 28,333 (2,289) $ (9,608) 109,770
Net income           12,604
Other comprehensive income           (918)
Balance (in shares) at Jun. 30, 2018 20,836,847       1,480,250  
Balance at Jun. 30, 2018 $ 208 95,122 38,234 (3,207) $ (9,613) 120,744
Balance (in shares) at Mar. 31, 2018 20,779,867       1,480,101  
Balance at Mar. 31, 2018 $ 208 94,040 30,836 (2,006) $ (9,608) 113,470
Net income 8,751 8,751
Other comprehensive income (1,201) (1,201)
Issuance of common stock for stock options exercised (in shares) 56,215        
Issuance of common stock for stock options exercised 446 446
Vested restricted stock units (in shares) 765        
Vested restricted stock units
Stock-based compensation expense 636 636
Repurchase of common stock at cost (in shares)       149  
Repurchase of common stock at cost $ (5) (5)
Common stock dividend accrued (1,353) (1,353)
Balance (in shares) at Jun. 30, 2018 20,836,847       1,480,250  
Balance at Jun. 30, 2018 $ 208 95,122 38,234 (3,207) $ (9,613) 120,744
Balance (in shares) at Dec. 31, 2018 21,110,224       1,501,511  
Balance at Dec. 31, 2018 $ 211 98,442 45,831 (3,900) $ (10,349) 130,235
Net income 3,513 3,513
Other comprehensive income (192) (192)
Issuance of common stock for stock options exercised (in shares) 61,419        
Issuance of common stock for stock options exercised $ 1 478 479
Vested restricted stock units (in shares) 2,026        
Vested restricted stock units
Stock-based compensation expense 746 746
Repurchase of common stock at cost (in shares)       926  
Repurchase of common stock at cost $ (21) (21)
Common stock dividend accrued (1,672) (1,672)
Balance (in shares) at Mar. 31, 2019 21,173,669       1,502,437  
Balance at Mar. 31, 2019 $ 212 99,666 47,672 (4,092) $ (10,370) 133,088
Balance (in shares) at Dec. 31, 2018 21,110,224       1,501,511  
Balance at Dec. 31, 2018 $ 211 98,442 45,831 (3,900) $ (10,349) 130,235
Net income           8,137
Other comprehensive income           82
Balance (in shares) at Jun. 30, 2019 21,250,872       1,503,445  
Balance at Jun. 30, 2019 $ 213 100,890 50,624 (3,818) $ (10,372) 137,537
Balance (in shares) at Mar. 31, 2019 21,173,669       1,502,437  
Balance at Mar. 31, 2019 $ 212 99,666 47,672 (4,092) $ (10,370) 133,088
Net income 4,624 4,624
Other comprehensive income 274 274
Issuance of common stock for stock options exercised (in shares) 77,032        
Issuance of common stock for stock options exercised $ 1 530 531
Vested restricted stock units (in shares) 171        
Vested restricted stock units
Stock-based compensation expense 694 694
Repurchase of common stock at cost (in shares)       1,008  
Repurchase of common stock at cost $ (2) (2)
Common stock dividend accrued (1,672) (1,672)
Balance (in shares) at Jun. 30, 2019 21,250,872       1,503,445  
Balance at Jun. 30, 2019 $ 213 $ 100,890 $ 50,624 $ (3,818) $ (10,372) $ 137,537