Note 13 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
	2018			2017			2016
Current provision −
Federal	$	31,819		$	22,443		$	15,236
State		6,291			4,030			2,300
		38,110			26,473			17,536
Deferred provision −
Federal		6,082			(64,821	)		8,260
State		(85	)		2,618			71
		5,997			(62,203	)		8,331
Provision (benefit) for income taxes	$	44,107		$	(35,730	)	$	25,867

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended December 31,
	2018		2017			2016
Income taxes at the federal statutory rate	$	38,469	$	47,749		$	23,255
State income taxes, net of federal benefit		4,913		3,246			1,552
Tax effect of permanent differences		596		(4,097	)		887
Revaluation of deferred taxes		−		(82,862	)		−
Other, net		129		234			173
(Benefit) provision for income taxes	$	44,107	$	(35,730	)	$	25,867

Schedule of Income Taxes Related to Other Comprehensive Income [Table Text Block]

	Year Ended December 31,
	2018		2017		2016
Income tax expense (benefit) related to components of other comprehensive income:
Change in fair value of available-for-sale securities		−		183		13
Total	$	−	$	183	$	13
Paid in capital – stock based compensation	$	−	$	−	$	294

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	2018			2017
Deferred income tax (assets) liabilities:
Inventory	$	(4,076	)	$	(3,637	)
Accounts receivable		(231	)		(157	)
Capital lease obligations		(16,202	)		(19,480	)
Stock options		(9,026	)		(6,899	)
Accrued liabilities		(2,481	)		(2,533	)
State net operating loss carry forward		(2,463	)		(2,262	)
State tax credit		(312	)		(410	)
Other		(3,276	)		(3,627	)
Difference between book and tax basis- Depreciation and amortization		179,325			174,266
		141,258			135,261
Valuation allowance		50			50
Net deferred income tax liability	$	141,308		$	135,311

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	2018			2017			2016
Unrecognized tax benefits at beginning of period	$	2,555		$	2,401		$	2,332
Gross increases – tax positions in current year		504			619			429
Reductions due to lapse of statute of limitations		(670	)		(465	)		(360	)
Unrecognized tax benefits at end of period	$	2,389		$	2,555		$	2,401