Note 10 - Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

				Weighted
				Average
				Exercise Price
	Shares			Per Option
Options outstanding, December 31, 2015		225,000			1.52
Granted to non-employee directors		45,000			3.45
Granted to employees		810,000			2.12
Exercised		(15,000	)		1.15
Canceled/expired/forfeited		-			-
Options outstanding, December 31, 2016		1,065,000			2.06
Granted to non-employee directors		85,000			3.83
Exercised		(111,669	)		1.88
Canceled/expired/forfeited		(153,333	)		1.58
Options outstanding, December 31, 2017		884,998			2.26
Options exercisable, December 31, 2017		333,334			1.98

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Stock Options
	For the Years Ended December 31,
	2017			2016
Exercise price	$	3.83		$	2.19
Risk-free interest rate		2.13	%		1.13	%
Expected volatility		58.38	%		59.16	%
Expected life in years		4.25			4.25
Dividend rate		-			-
Black-Scholes fair value	$	1.81		$	1.03

Share-based Compensation, Activity [Table Text Block]

			Options Outstanding								Options Exercisable
Range of Exercise Prices			Options		Weighted Average Exercise Price		Weighted Average Remaining Contract Life (in years)		Aggregate Intrinsic Value		Options		Weighted Average Exercise Price		Weighted Average Remaining Contract Life (in years)		Aggregate Intrinsic Value
$1.51	-	$3.90		884,998	$	2.26		3.91	$	1,541,000		333,334	$	1.98		3.19	$	673,000