Significant components of our deferred income taxes consist of the following: (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax liabilities:
Excess tax depreciation	$ (253)
Total deferred tax liabilities	(253)
Deferred tax assets:
Net operating loss carryforwards	13,416	14,566
179 Carryforwards	117
163(j) Business interest limitation carryforwards	98
Deferred revenue	202
Inventory and other allowances	177	148
Excess (tax) book depreciation		31
Excess (tax) book amortization	59	63
174 research & experimental expenditures	480
Share-based compensation	394	308
Other accrued costs	238	161
Total deferred tax assets	15,181	15,277
Less:  Valuation allowance	(14,928)	(15,277)
Deferred income taxes