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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 2,924 $ 1,126
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 1,454 1,652
Non-cash interest expense 9 12
Non-cash rent expense 51 (38)
Bad debt expense (1) (4)
Deferred revenue (15) (48)
Stock-based compensation 301 232
Deferred income taxes 0 369
Loss (gain) on sale of property and equipment 83 28
(Increase) decrease in operating assets:    
Accounts receivable (1,154) (1,041)
Inventories (361) (262)
Refundable income taxes (323) 65
Prepaid expenses and other current assets 255 502
Increase (decrease) in operating liabilities:    
Accounts payable (305) (172)
Accrued expenses 1,276 (448)
Accrued income taxes (547) (62)
Net cash provided by operating activities 3,647 1,911
Cash flows from investing activities:    
Purchases of property and equipment (1,161) (728)
Proceeds from sale of property and equipment 0 5
Net cash used in investing activities (1,161) (723)
Cash flows from financing activities:    
Purchase of treasury stock 0 (405)
Net cash used in financing activities 0 (405)
Net increase in cash and cash equivalents 2,486 783
Cash and cash equivalents at the beginning of the period 7,926 3,836
Cash and cash equivalents at the end of the period 10,412 4,619
Supplemental cash flow information:    
Cash paid for income taxes, net of (refunds) 2,194 82
Cash paid for interest 33 61
Non-cash investing activities    
Increase (decrease) in right-of-use assets and operating lease obligations 27 (58)
Non-cash financing activities    
Issuance of common stock under equity incentive plans $ 0 $ 522