Note 5 - Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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

Stock Options
	Number of shares
	Incentive Stock Option			Non- Incentive Stock Option			Weighted Average Exercise Price
Balance outstanding as of January 1, 2018		46,000			25,000		$	15.74
Granted		-			-			-
Exercised		(4,500	)		-			5.28
Forfeited		(20,000	)		(10,000	)		28.71
Balance outstanding as of March 31, 2018		21,500			15,000		$	6.37
Options exercisable as of March 31, 2018		21,500			15,000		$	6.37

Nonvested Restricted Stock Shares Activity [Table Text Block]

Restricted Stock
	Number of Shares			Weighted Average Grant- Date Fair Value
Balance of shares non-vested as of January 1, 2018		45,550		$	16.44
Granted		12,838			22.41
Vested		(22,597	)		16.49
Forfeited		-			-
Balance of shares non-vested as of March 31, 2018		35,791		$	18.54

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

Performance Stock Units
	Performance Stock Units		Weighted Average Grant-Date Fair Value
Balance of shares non-vested as of January 1, 2018		55,823	$	20.48
Granted		-		-
Vested		-		-
Forfeited		-		-
Balance of shares non-vested as of March 31, 2018		55,823	$	20.48