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Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities    
Net loss $ (1,270) $ (3,936)
Adjustments to reconcile net loss net cash provided by (used in) operating activities:    
Inventories allowances (86) 48
Depreciation and amortization 378 342
Share-based compensation expense-stock options 58 85
Share-based compensation expense-restricted stock units 69 70
Loss on investments 113 496
Changes in operating assets and liabilities:    
Trade accounts receivable (174) 3,466
Inventories (637) (4,161)
Prepaid expenses and other current assets 152 (904)
Other assets (244) 1
ROU assets and lease liabilities (12) (8)
Accounts payable 1,172 1,371
Accrued compensation and related taxes 430 351
Accrued warranty expense 78 (21)
Deferred revenue 820 (108)
Accrued other expenses and other current liabilities (289) (387)
Net cash provided by (used in) operating activities 558 (3,295)
Investing activities    
Purchases of property, plant, and equipment (592) (345)
Net cash used in investing activities (592) (345)
Financing activities    
Proceeds from common stock issuance 15 0
Cash dividends paid 0 (505)
Proceeds from the credit facility and notes payable 20,809 0
Repayment of the credit facility and notes payable (19,885) (78)
Net cash provided by (used in) financing activities 939 (583)
Net change in cash and cash equivalents 905 (4,223)
Cash and cash equivalents, beginning of period 1,918 10,580
Cash and cash equivalents, end of period 2,823 6,357
Supplemental disclosure    
Cash paid for interest 154 15
Non-cash financing activity    
Common stock issued under restricted stock units $ 31 $ 40