Note 6 - Stock-Based Compensation (Details) (USD $)	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended	1 Months Ended	0 Months Ended			6 Months Ended	0 Months Ended		12 Months Ended		1 Months Ended
	Dec. 31, 2004 Stock Options And Stock Appreciation Rights [Member] Share-based Compensation Award, Tranche One [Member] 2004 Stock Incentive Plan [Member]	May 31, 2012 Stock Options And Stock Appreciation Rights [Member] Share-based Compensation Award, Tranche One [Member] 2012 Stock Incentive Plan [Member]	Dec. 31, 2004 Stock Options And Stock Appreciation Rights [Member] Share-based Compensation Award, Tranche Two [Member] 2004 Stock Incentive Plan [Member]	May 31, 2012 Stock Options And Stock Appreciation Rights [Member] Share-based Compensation Award, Tranche Two [Member] 2012 Stock Incentive Plan [Member]	Dec. 31, 2004 Stock Options And Stock Appreciation Rights [Member] Share-based Compensation Award, Tranche Two [Member] 2012 Stock Incentive Plan [Member]	Dec. 31, 2004 Stock Options And Stock Appreciation Rights [Member] Share-based Compensation Award, Tranche Three [Member] 2004 Stock Incentive Plan [Member]	May 31, 2012 Stock Options And Stock Appreciation Rights [Member] Share-based Compensation Award, Tranche Three [Member] 2012 Stock Incentive Plan [Member]	Dec. 31, 2004 Employee Stock Option [Member] Non Employee Director [Member] 2004 Stock Incentive Plan [Member]	May 31, 2012 Employee Stock Option [Member] Non Employee Director [Member] 2012 Stock Incentive Plan [Member]	Feb. 11, 2014 Employee Stock Option [Member] Chief Financial Officer [Member] 2012 Stock Incentive Plan [Member]	Apr. 02, 2014 Options to Purchase 300,000 Shares of Common Stock [Member] Chief Executive Officer [Member] 2012 Stock Incentive Plan [Member]	Apr. 02, 2014 Options to Purchase 100,000 Shares of Common Stock [Member] Chief Executive Officer [Member] 2012 Stock Incentive Plan [Member]	Jun. 30, 2014 Officer [Member] 2012 Stock Incentive Plan [Member]	Feb. 11, 2014 Chief Financial Officer [Member] 2012 Stock Incentive Plan [Member]	Apr. 02, 2014 Chief Executive Officer [Member] 2012 Stock Incentive Plan [Member]	Dec. 31, 2004 2004 Stock Incentive Plan [Member]	May 31, 2012 2012 Stock Incentive Plan [Member]	May 31, 2012 Minimum [Member] 2012 Stock Incentive Plan [Member]	May 31, 2012 Maximum [Member] 2012 Stock Incentive Plan [Member]
Note 6 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)																3,750,000	4,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%	25.00%	25.00%	25.00%		50.00%	50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	24 months	24 months		36 months	36 months	48 months	48 months	1 year	1 year	3 years	4 years
Share Based Compensation Arrangement By Share Based Payment Award Awards Exercise Period																10 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period										5 years	6 years	7 years						6 years	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares)													400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures (in Shares)														32,500
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)														$ 24.57	$ 29.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)											$ 12.88	$ 8.33		$ 5.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)															400,000