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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:    
Net income $ 924 $ 3,311
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 2,972 2,873
Non-cash interest expense 6 11
Non-cash rent expense 0 1
Bad debt expense 0 2
Deferred revenue (28) (30)
Stock-based compensation 1,109 1,144
Deferred income taxes (172) 257
Loss on sale of property and equipment 241 88
(Increase) decrease in operating assets:    
Accounts receivable (1,483) (1,931)
Inventories (1,345) (1,356)
Refundable income taxes 300 (313)
Prepaid expenses and other current assets (191) (91)
Increase (decrease) in operating liabilities:    
Accounts payable 1,945 1,022
Accrued expenses 434 504
Accrued income taxes (725) 72
Net cash provided by operating activities 3,987 5,564
Cash flows from investing activities:    
Purchases of property and equipment (3,449) (1,922)
Acquisition, net of cash acquired (580) (5,220)
Net cash used in investing activities (4,029) (7,142)
Cash flows from financing activities:    
Purchase of treasury stock (3,997) (1,583)
Payment of deferred financing cost 0 (32)
Proceeds from note payable 0 5,000
Repayment of note payable (750) (500)
Net cash (used in) provided by financing activities (4,747) 2,885
Net (decrease) increase in cash and cash equivalents (4,789) 1,307
Cash and cash equivalents at the beginning of the period 9,233 7,926
Cash and cash equivalents at the end of the period 4,444 9,233
Supplemental cash flow information:    
Cash paid for income taxes, net of (refunds) 1,121 2,288
Cash paid for interest 247 102
Non-cash investing activities    
Increase in right-of-use assets and operating lease obligations 83 45
Business acquisition escrow payable $ 0 $ 580