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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net income $ 9,197 $ 13,973
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,210 6,120
Loss on sale of fixed assets 298 0
Share-based compensation 1,338 1,169
Deferred income taxes 977 1,252
Changes in operating assets and liabilities:    
Receivables, net 1,284 (475)
Inventories (1,212) 357
Prepaid expenses and other current assets (1,396) (453)
Refundable income taxes (297) 249
Other assets 76 35
Accounts payable (255) (220)
Accrued expenses (68) 689
Deferred revenue (628) 25
Non-qualified deferred compensation plan and other liabilities 1,214 (335)
Net cash provided by operating activities 16,738 22,386
Cash flows from investing activities:    
Additions to property, plant, and equipment (3,057) (4,381)
Proceeds from sale of fixed assets 105 0
Net cash used in investing activities (2,952) (4,381)
Cash flows from financing activities:    
Proceeds from advances on revolving line of credit 5,500 0
Payments on revolving line of credit (5,500) (8,000)
Principal repayments of long-term debt 0 (2,143)
Principal payments on finance lease obligation (7) 0
Proceeds from exercise of stock options 474 561
Payment of statutory withholdings for restricted stock units vested (561) (271)
Net cash used in financing activities (94) (9,853)
Net increase in cash and cash equivalents 13,692 8,152
Cash and cash equivalents at beginning of period 3,743 3,238
Cash and cash equivalents at end of period $ 17,435 $ 11,390