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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net income $ 3,891 $ 3,734
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,066 2,022
Gain on sale of fixed assets (4)
Share-based compensation 537 294
Deferred income taxes 421 424
Changes in operating assets and liabilities:    
Receivables, net (801) (1,451)
Inventories (1,966) 139
Prepaid expenses (446) 364
Refundable income taxes 284 781
Other assets 247 (338)
Accounts payable 2,726 (907)
Accrued expenses (2,133) (2,506)
Deferred revenue (142) 465
Non-qualified deferred compensation plan and other liabilities 62 608
Net cash provided by operating activities 4,742 3,629
Cash flows from investing activities:    
Additions to property, plant, and equipment (1,020) (1,388)
Proceeds from sale of fixed assets 13
Net cash used in investing activities (1,007) (1,388)
Cash flows from financing activities:    
Payments on revolving line of credit (3,000)
Proceeds from exercise of stock options 416 285
Payment of statutory withholdings for restricted stock units vested (560) (271)
Net cash used in financing activities (144) (2,986)
Net increase (decrease) in cash and cash equivalents 3,591 (745)
Cash and cash equivalents at beginning of period 3,743 3,238
Cash and cash equivalents at end of period $ 7,334 $ 2,493