Note 11 - Stockholders' equity (Tables)

12 Months Ended

Dec. 31, 2012

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

	Beginning Balance Outstanding		Granted During Period		Exercised During Period		Canceled During Period		Ending Balance Outstanding		Exercisable
Year ended December 31, 2011
Number of shares		180,250		-0-		78,250		0		102,000		102,000
Weighted average exercise price Per share	$	3.97		-0-		-0-		-0-	$	4.35	$	4.35
Year ended December 31, 2012
Number of shares		102,000		-0-		60,100		-0-		41,900		41,900
Weighted average exercise price Per share	$	4.35		-0-		-0-		-0-	$	4.82	$	4.82

	Beginning Balance Outstanding		Granted During Period		Exercised During Period		Canceled During Period		Ending Balance Outstanding		Exercisable
Year ended December 31, 2011
Number of shares		211,300		14,000		53,310		1,400		170,590		120,590
Weighted average exercise price Per share	$	4.02	$	4.25		-0-		-0-	$	4.41	$	4.32
Year ended December 31, 2012
Number of shares		170,590		-0-		8,110		-0-		162,480		124,980
Weighted average exercise price Per share	$	4.41	$	4.25		-0-		-0-	$	4.35	$	4.27

	Beginning Balance Outstanding		Granted During Period		Exercised During Period		Canceled During Period		Ending Balance Outstanding		Exercisable
Year ended December 31, 2011
Number of shares		200		-0-		-0-		-0-		200		200
Weighted average exercise price Per share
Year ended December 31, 2012
Number of shares		200		-0-		-0-		-0-		200		200
Weighted average exercise price Per share			$	11.51					$	11.51	$	11.51

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

				Options Outstanding								Options Exercisable
Exercise Price Range				Number Outstanding		Weighted Average Remaining Contractual		Weighted Average Exercise Price		Intrinsic Value		Number Exercisable		Weighted Average Exercise Price		Intrinsic Value
$	3.00	-	3.99		72,000		4.95	$	3.65	$	428,400		72,000	$	3.65	$	428,400
$	4.00	-	4.49		15,930		0.98	$	4.25	$	85,226		15,930	$	4.25	$	85,226
$	4.50	-	4.99		100,000		4.78	$	4.62	$	498,000		62,500	$	4.62	$	311,250
$	5.00	-	5.99		6,650		1.08	$	5.90	$	24,605		6,650	$	5.90	$	24,605
$	6.00	-	7.99		9,800		8.04	$	7.90	$	16,660		9,800	$	7.90	$	16,660
$	8.00	-	11.99		200		9	$	11.51	$	0		200	$	11.51		0

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

Year ended	Risk-Free Interest Rate			Expected Life (years)		Expected Volatility			Expected Dividends
December 31, 2011		1.95	%		5		63.01	%	None