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Quarterly Financial Statements (Unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Statements (Unaudited) QUARTERLY FINANCIAL STATEMENTS (UNAUDITED)
The following table presents a summary of our results of operations for our eight most recent quarters ended December 31, 2019. The information for each of these quarters is unaudited and has been prepared on a basis consistent with the audited financial statements. This information includes all adjustments, consisting only of normal recurring adjustments, we consider necessary for fair presentation of this information when read in conjunction with the audited financial statements and related notes. Our operating results have varied on a quarterly basis and may fluctuate significantly in the future.
 
(In thousands, except for per share data)1st Quarter2nd Quarter3rd Quarter4th Quarter
Year Ended December 31, 2019
Sales revenues$69,141  $66,156  $68,699  $70,638  
Gross profit37,115  34,535  35,915  36,580  
Operating income 6,048  3,616  6,007  8,912  
Net income 3,444  1,663  4,135  11,226  
Net income per share
Basic$0.24  $0.12  $0.29  $0.78  
Diluted$0.24  $0.12  $0.29  $0.78  
Year Ended December 31, 2018
Sales revenues$70,882  $67,905  $69,297  $72,327  
Gross profit39,085  34,846  36,113  39,684  
Operating income 7,648  2,225  5,361  9,648  
Net income 3,967  328  5,749  7,588  
Net income per share
Basic$0.29  $0.02  $0.41  $0.54  
Diluted$0.29  $0.02  $0.41  $0.54