Note 9 - Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Share-based Payment Arrangement, Option, 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, 2019		12,500			5,000		$	5.14
Granted		-			-			-
Exercised		(7,500	)		(2,500	)		5.19
Forfeited		-			-			-
Balance outstanding as of March 31, 2019		5,000			2,500		$	5.08
Options exercisable as of March 31, 2019		5,000			2,500		$	5.08

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, 2019		32,349		$	18.93
Granted		15,434			23.85
Vested		(18,966	)		17.49
Forfeited		-			-
Balance of shares non-vested as of March 31, 2019		28,817		$	22.52

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, 2019		47,322	$	20.48
Granted		-		-
Vested		-		-
Forfeited		-		-
Balance of shares non-vested as of March 31, 2019		47,322	$	20.48