Note 5 - Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	2018			2017
Retail customers	$	30,101		$	22,227
Wholesale carriers		6,346			8,146
Other		6,409			4,891
		42,856			35,264
Less: allowance for doubtful accounts		(3,041	)		(2,729	)
Accounts receivable, net	$	39,815		$	32,535

Changes in the Allowance for Doubtful Accounts [Table Text Block]

	2018
Balance at January 1	$	2,729
Provision for uncollectible accounts		1,092
Charged to other accounts		(435	)
Deductions		(345	)
Balance at June 30	$	3,041