CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities
Net Loss	$ 3,936	$ 670
Adjustments To Reconcile Net Loss To Net Cash (used In) Provided By Operating Activities:
Inventories Allowances	(48)	(300)
Depreciation And Amortization	342	298
Share-based Compensation Expense-stock Options	85	32
Share-based Compensation Expense-restricted Stock Units	70	103
Loss (gain) On Investment In Securities	(496)	205
Changes In Operating Assets And Liabilities:
Trade Accounts Receivable	(3,466)	(1,900)
Inventories	4,161	1,394
Prepaid Expenses And Other Current Assets	904	(57)
Other Assets	(1)	6
Rou Asset And Lease Liabilities	(8)	(4)
Accounts Payable	1,371	299
Accrued Compensation And Related Taxes	(351)	315
Accrued Warranty Expense	(21)	(73)
Deferred Revenue	(108)	(138)
Accrued Other Expenses And Other Current Liabilities	(387)	(145)
Net Cash (used In) Provided By Operating Activities	(3,295)	39
Investing Activities
Purchases Of Property, Plant, And Equipment	(345)	(1,031)
Net Cash Used In Investing Activities	(345)	(1,031)
Financing Activities
Cash Dividends Paid	(505)	(250)
Proceeds From The Credit Facility	0	800
Repayment Of The Credit Facility And Notes Payable	(78)	(21)
Net Cash (used In) Provided By Financing Activities	(583)	529
Net Change In Cash And Cash Equivalents	(4,223)	(463)
Cash And Cash Equivalents, Beginning Of Period	10,580	6,826
Cash And Cash Equivalents, End Of Period	6,357	6,363
Supplemental Disclosure
Cash Paid For Interest	15	4
Non-cash Financing Activity
Common Stock Issued Under Restricted Stock Units	$ 40	$ 84