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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 1,377 $ (706)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation 500 487
Amortization 229  
Non-cash reserve charges (9) 2
Stock-based compensation 589 108
Non-cash lease expense 97 55
Benefit for deferred income taxes (220) (378)
Gain on change in fair value of contingent consideration (200)  
Change in operating assets and liabilities, net of the effects of acquisitions:    
Accounts receivable 787 (1,037)
Prepaid and other assets (912) (182)
Accounts payable and other accrued expenses 2,583 (798)
Inventory (3,067) (2,863)
Deposits   7
Net cash provided by (used in) operating activities 1,754 (5,305)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (72) (299)
Net cash used in investing activities (72) (299)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments on finance lease obligations (28) (23)
Cash dividends paid (3,613)  
Purchase of treasury stock   (75)
Proceeds from the issuance of common stock on stock-based awards 3 27
Principal payments on long-term debt (1,333)  
Taxes withheld and paid on employees' equity awards (76) (59)
Net cash used in financing activities (5,047) (130)
Net decrease in cash (3,365) (5,734)
Cash at beginning of period 42,612 39,173
Cash at end of period 39,247 33,439
Supplemental disclosure of cash flow information:    
Cash paid for interest (89) (9)
Cash paid for rent (995) (521)
Supplemental disclosure of non-cash investing and financing activities:    
Right-of-use assets obtained in exchange for new operating lease liabilities 211 162
Inventory transferred to property and equipment under lease 339 473
Capital expenditures not yet paid $ 56  
Inventory transferred to property and equipment as demo devices   $ 67