8. Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of income tax expense/benefit

	Years Ended December 31,
	2019			2018
Current:
Federal	$	(107	)	$	(110	)
State		(3	)		10
		(110	)		(100	)
Deferred:
Federal		(889	)		(280	)
State		12			103
		(877	)		(177	)
	$	(987	)	$	(277	)

Schedule of effective income tax rate

	Years Ended December 31,
	2019			2018
Statutory U.S. income tax rate		(21.00	)%		(21.00	)%
State taxes, net of federal benefit		(1.21	)%		1.75	%
Permanent differences		0.61	%		3.52	%
Change in valuation allowance		0.00	%		(13.53	)%
Change in net operating loss carryforwards and tax credits		(5.50	)%		(33.48	)%
Other		(0.14	)%		4.02	%
Effective income tax rate		(27.24	)%		(58.72	)%

Schedule of deferred tax assets and liabilities

	Years Ended December 31,
	2019			2018
Deferred tax assets:
Operating loss carryforwards	$	1,347		$	313
R&D Tax Credit		1,678			1,394
AMT Tax Credit		72			179
Section 263A costs		294			252
R&D costs		110			224
Amortization		24			24
Unrealized loss		252			422
Asset reserves:
Bad debts		11			12
Inventory allowance		187			146
Accrued expenses:
Non-qualified stock options		132			112
Compensation		132			140
Warranty		904			764
Deferred tax assets		5,143			3,982
Less state valuation allowance		—			—
Total deferred tax assets		5,143			3,982
Deferred tax liabilities:
Depreciation		(770	)		(487	)
Total deferred tax liabilities		(770	)		(487	)
Net deferred tax assets (before unrealized gain)		4,373			3,495
Deferred tax liability: unrealized gain		—			—
Net deferred tax assets	$	4,373		$	3,495