8. Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of income tax expense/(benefit)

	Years Ended December 31,
	2020			2019
Current:
Federal	$	(72	)	$	(107	)
State		3			(3	)
		(69	)		(110	)
Deferred:
Federal		(44	)		(889	)
State		116			12
		72			(877	)
	$	3		$	(987	)

Schedule of effective income tax rate

	Years Ended December 31,
	2020			2019
Statutory U.S. income tax rate		21.00	%		(21.00	)%
State taxes, net of federal benefit		6.00	%		(1.21	)%
Permanent differences		3.45	%		0.61	%
Change in valuation allowance		38.83	%		0.00	%
Change in net operating loss carryforwards and tax credits		(67.58	)%		(5.50	)%
Other		(0.50	)%		(0.14	)%
Effective income tax rate		1.20	%		(27.24	)%

Schedule of deferred tax assets and liabilities

	Years Ended December 31,
	2020			2019
Deferred tax assets:
Operating loss carryforwards	$	1,238		$	1,347
R&D Tax Credit		1,952			1,678
AMT Tax Credit		—			72
Section 263A costs		203			294
R&D costs		—			110
Amortization		21			24
Unrealized loss		391			252
Asset reserves:
Bad debts		11			11
Inventory allowance		118			187
Accrued expenses:
Non-qualified stock options		175			132
Compensation		64			132
Warranty		927			904
Deferred tax assets		5,098			5,143
Less valuation allowance		(98	)		—
Total deferred tax assets		5,000			5,143
Deferred tax liabilities:
Depreciation		(700	)		(770	)
Total deferred tax liabilities		(700	)		(770	)
Net deferred tax assets (before unrealized gain)		4,300			4,373
Deferred tax liability: unrealized gain		—			—
Net deferred tax assets	$	4,300		$	4,373