Note 11 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

	Beginning		Granted		Exercised		Canceled		Ending
	Balance		During		During		During		Balance
	Outstanding		Period		Period		Period		Outstanding		Exercisable
Year ended December 31, 2017
Number of shares		59,730		-		36,800		-		22,930		22,930
Weighted average exercise price per share	$	4.51		-	$	3.97		-	$	5.36	$	5.36
Year ended December 31, 2018				-
Number of shares		22,930		-		-		-		22,930		22,930
Weighted average exercise price per share	$	5.36		-		-		-	$	5.36	$	5.36

	Beginning		Granted		Exercised		Canceled		Ending
	Balance		During		During		During		Balance
	Outstanding		Period		Period		Period		Outstanding		Exercisable
Year ended December 31, 2017
Number of shares		225,000		140,000		-		-		365,000		185,000
Weighted average exercise price per share	$	9.43	$	10.82		-		-	$	12.35	$	13.76
Year ended December 31, 2018
Number of shares		365,000		-		-		-		365,000		235,000
Weighted average exercise price per share	$	12.35		-		-		-	$	12.35	$	13.15

	Beginning		Granted		Exercised		Canceled		Ending
	Balance		During		During		During		Balance
	Outstanding		Period		Period		Period		Outstanding		Exercisable
Year ended December 31, 2017
Number of shares		-		-		-		-		-		-
Weighted average exercise price per share		-		-		-		-		-		-
Year ended December 31, 2018
Number of shares		-		20,000		-		-		20,000		-
Weighted average exercise price per share		-	$	8.07		-		-	$	8.07		-

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

			Options Outstanding								Options Exercisable
					Weighted		Weighted						Weighted
					Average		Average						Average
Exercise			Number		Remaining		Exercise		Intrinsic		Number		Exercise		Intrinsic
Price Range			Outstanding		Contractual		Price		Value		Exercisable		Price		Value
$4.00	-	7.00		15,930		1		$4.25		$0		15,930		$4.25		$0
$7.01	-	10.00		27,000		2		$8.03		$0		7,000		$7.90		$0
$10.01	-	12.00		240,000		7.3		$10.88		$0		110,000		$11.05		$0
$12.01	-	15.00		125,000		3.5		$15.00		$0		125,000		$15.00		$0

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

				Weighted
				Average Grant
	Shares of			Date Fair
	Restricted Stock			Value
Unvested outstanding at December 31, 2016		0		$	0
Granted		9,300		$	9.70
Vested		(9,300	)	$	9.70
Forfeited/Cancelled
Unvested outstanding at December 31, 2017		0		$	0
Granted		11,000		$	10.53
Vested		(11,000	)	$	10.53
Forfeited/Cancelled
Unvested outstanding at December 31, 2018		0		$	0

				Weighted
	Shares of			Average Grant
	Restricted			Date Fair
	Stock Units			Value
Unvested outstanding at December 31, 2016		114,090		$	10.47
Granted		23,680		$	9.29
Vested		(63,775	)	$	9.94
Forfeited/Cancelled		(125	)	$	14.61
Unvested outstanding at December 31, 2017		73,870		$	10.05
Granted		39,260		$	8.75
Vested		(67,067	)	$	9.26
Forfeited/Cancelled		0			0
Unvested outstanding at December 31, 2018		46,063		$	8.25