Note 10 - Stock-Based Compensation (Details) - Information Regarding the Company's Stock Option Plans (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Note 10 - Stock-Based Compensation (Details) - Information Regarding the Company's Stock Option Plans [Line Items]
Options granted	146,400
Employee Stock Option [Member]
Note 10 - Stock-Based Compensation (Details) - Information Regarding the Company's Stock Option Plans [Line Items]
Number of Shares		622,300
Weighted Average Exercise Price per Share		$ 12.34
Weighted Average Remaining Contractual Term	4 years	3 years 255 days
Aggregate Intrinsic Value		$ 2,174,673
Exercisable at June 30, 2014	523,406
Exercisable at June 30, 2014	$ 12.46
Exercisable at June 30, 2014	3 years 146 days
Exercisable at June 30, 2014	1,771,538
Options granted	146,400
Options granted	$ 15.86
Options granted	6 years 6 months
Options cancelled/expired	(3,800)
Options cancelled/expired	$ 15.46
Options exercised	(54,100)
Options exercised	$ 9.94
Number of Shares	710,800
Weighted Average Exercise Price per Share	$ 13.23
Weighted Average Remaining Contractual Term	4 years	3 years 255 days
Aggregate Intrinsic Value	$ 1,860,165