Note 8 - Benefit Plans (Tables)

6 Months Ended

Jun. 30, 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		(12,000	)		(5,000	)		7.78
Forfeited		(20,000	)		(10,000	)		28.71
Balance outstanding as of June 30, 2018		14,000			10,000		$	5.16
Options exercisable as of June 30, 2018		14,000			10,000		$	5.16

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		(25,063	)		16.31
Forfeited		-			-
Balance of shares non-vested as of June 30, 2018		33,325		$	18.83

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		55,283	$	20.48
Granted		-		-
Vested		-		-
Forfeited		-		-
Balance of shares non-vested as of June 30, 2018		55,283	$	20.48