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Note 13 - Share-based Payments (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

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

		Three months ended March 31, 2017								Three months ended March 31, 2016
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average e xercise price per share

Outstanding, beginning of period			474,501			$	12.67				513,366			$	9.24
Granted			32,875				40.56				55,000				20.89
Exercised			(68,876	)			7.83				(11,574	)			4.63
Forfeited			(7,889	)			18.46				(5,401	)			12.24
Expired			-				-				(750	)			3.76
Outstanding, end of period			430,611				15.46				550,641				10.48
Options exercisable, end of period			264,753			$	10.72				311,594			$	6.54

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

				Options outstanding																Options exercisable
Exercise price				Number outstanding				Weighted average exercise price per share				Weighted average remaining contractual life (years)				Aggregate intrinsic value				Number exercisable				Weighted average exercise price per share				Weighted average remaining contractual life (years)				Aggregate intrinsic value

$ 2.80	-	$ 8.92			173,473			$	6.11				1.9			$	7,796,487				159,554			$	5.89				1.8			$	7,205,069
$10.16	-	$19.95			140,013				16.26				4.1				4,871,179				77,699				16.01				3.8				2,722,299
$21.10	-	$27.53			84,250				23.61				5.0				2,312,190				27,500				23.73				4.2				751,250
$35.25	-	$37.35			14,375				35.89				6.2				217,937				-				-				-				-
$43.15	-	$47.00			18,500				44.19				6.8				126,900				-				-				-				-
					430,611			$	15.46				3.6			$	15,324,693				264,753			$	10.72				2.6			$	10,678,618