Note 7 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

Share-based Compensation, Stock Options, Activity [Table Text Block]

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term in Years		Intrinsic Value
Options outstanding at January 1, 2017		81,893		$	2.95
Options exercised		(21,800	)		2.95
Options outstanding at June 30, 2017		60,093		$	2.95		1.7	$	1,103,000
Options exercisable at June 30, 2017		60,093		$	2.95		1.7	$	1,103,000

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term in Years		Intrinsic Value
Options outstanding at January 1, 2017		192,800		$	7.60
Options exercised		(16,800	)		6.55
Options outstanding at June 30, 2017		176,000		$	7.70		5.9	$	2,394,000
Options exercisable at June 30, 2017		76,200		$	7.08		5.4	$	1,084,000
Expected to vest after June 30, 2017		88,922		$	8.18		6.2	$	1,167,000

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2016
Expected life of stock options (in years)		5.1
Risk free interest rate		1.52%
Volatility		53.6%
Dividend yields		2.00%
Weighted-average fair value of options granted during the six months ended June 30, 2016		$3.55