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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net income $ 6,209 $ 8,332
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,150 4,050
Loss on sale of fixed assets 286 0
Share-based compensation 1,098 696
Deferred income taxes 731 837
Changes in operating assets and liabilities:    
Receivables, net 1,377 (2,360)
Inventories (2,683) 538
Prepaid expenses (1,115) (61)
Refundable income taxes 483 1,568
Other assets (5) (178)
Accounts payable 735 (1,222)
Accrued expenses (1,370) 30
Deferred revenue 74 444
Non-qualified deferred compensation plan and other liabilities 766 (316)
Net cash provided by operating activities 10,736 12,358
Cash flows from investing activities:    
Additions to property, plant, and equipment (2,151) (2,819)
Proceeds from sale of fixed assets 27 0
Net cash used in investing activities (2,124) (2,819)
Cash flows from financing activities:    
Proceeds from advances on revolving line of credit 5,500 0
Payments on revolving line of credit (5,500) (7,000)
Principal repayments of long-term debt 0 (715)
Principal payments on finance lease obligation (3) 0
Proceeds from exercise of stock options 475 440
Payment of statutory withholdings for restricted stock units vested (561) (271)
Net cash used in financing activities (89) (7,546)
Net increase in cash and cash equivalents 8,523 1,993
Cash and cash equivalents at beginning of period 3,743 3,238
Cash and cash equivalents at end of period $ 12,266 $ 5,231