Note 2 - Allowance for Doubtful Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

Allowance for Credit Losses on Financing Receivables [Table Text Block]

	2015			2014
Balance at the beginning of year	$	680,000		$	560,000
Provision for bad debts		266,000			197,000
Charge-offs		(98,000	)		(105,000	)
Recoveries		-			28,000
Balance at the end of year	$	848,000		$	680,000