Note 7 - Shareholders' Equity (Details) (USD $)	1 Months Ended				3 Months Ended	6 Months Ended						3 Months Ended		6 Months Ended		1 Months Ended	3 Months Ended		6 Months Ended		1 Months Ended							6 Months Ended			1 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended
	Jan. 31, 2011	Dec. 31, 2010	Mar. 31, 2008	Dec. 31, 2005	Jun. 30, 2013	Jun. 30, 2013	Jul. 01, 2012	Dec. 31, 2012	Jan. 03, 2011	Mar. 07, 2008	Dec. 19, 2005	Jun. 30, 2013 Employee Stock Option [Member]	Jul. 01, 2012 Employee Stock Option [Member]	Jun. 30, 2013 Employee Stock Option [Member]	Jul. 01, 2012 Employee Stock Option [Member]	Jan. 29, 2013 Restricted Stock Units (RSUs) [Member] Chief Executive Officer [Member]	Jun. 30, 2013 Restricted Stock [Member]	Jul. 01, 2012 Restricted Stock [Member]	Jun. 30, 2013 Restricted Stock [Member]	Jul. 01, 2012 Restricted Stock [Member]	Jan. 29, 2013 Vesting Condition 1 [Member]	Jan. 29, 2013 Vesting Condition 2 [Member]	Jan. 29, 2013 Vesting Condition 3 [Member]	Jan. 29, 2013 Vesting Condition 4 [Member]	Jun. 30, 2013 Long-Term Incentive Plan [Member]	Dec. 31, 2011 Long-Term Incentive Plan [Member]	Jun. 30, 2004 Long-Term Incentive Plan [Member]	Jun. 30, 2013 Incentive Stock Options [Member] Minimum [Member]	Jun. 30, 2013 Incentive Stock Options [Member] Maximum [Member]	Jun. 30, 2013 Non Qualified Stock Options [Member] Minimum [Member]	Dec. 31, 2010 Option Grant 1 [Member]	Dec. 30, 2010 Option Grant 1 [Member]	Dec. 31, 2010 Option Grant 2 [Member]	Dec. 30, 2010 Option Grant 2 [Member]	Dec. 31, 2010 Option Grant 3 [Member]	Dec. 30, 2010 Option Grant 3 [Member]	Dec. 31, 2010 Option Grant 4 [Member]	Dec. 30, 2010 Option Grant 4 [Member]
Note 7 - Shareholders' Equity (Details) [Line Items]
Treasury Stock, Shares					1,372,757	1,372,757		1,372,757
Treasury Stock, Value (in Dollars)					$ 7,658,000	$ 7,658,000		$ 7,658,000
Common Stock, Shares Authorized					40,000,000	40,000,000		40,000,000																		2,900,000	750,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years																											3 years	5 years	3 years	4 years		4 years		4 years		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number					2,169,538	2,169,538		2,211,488																	2,119,538
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	50,000		50,000	48,000		153,000																									50,000		250,000		200,000		200,000
Share Price (in Dollars per share)									$ 6.58	$ 12.74	$ 12.96																					$ 6.42		$ 6.42		$ 10.00		$ 15.00
Share Based Payment Award Options Annual Incremental Vesting	12,500																				30,000	30,000	30,000	30,000							12,500		62,500		50,000		50,000
Minimum Share Price Requirement (in Dollars per share)																					$ 4.00	$ 5.00	$ 4.00	$ 5.00												$ 10.00		$ 15.00
Number Of Days In Period Minimum Share Price Requirement																					15	15	15	15											15		15
Number Of Days In Period Minimum Share Price Requirement Term																					30	30	30	30											30		30
Share Based Payment Award Options Term		5
Share-based Compensation (in Dollars)						430,000	670,000					200,000	252,000	390,000	516,000		40	0	40	1,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)												917,000		917,000			394		394
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						1 year 237 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)					1,000
Proceeds from Stock Options Exercised (in Dollars)						12,000	115,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					120,000	120,000										120,000
Stock Issued During Period, Value, Restricted Stock Award, Gross (in Dollars)							$ 0