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Note 5 - Restructuring (Details) (USD $)
 3 Months Ended 6 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 57 Months Ended 3 Months Ended 6 Months Ended 57 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
October 2012 Plan [Member]
Employee Severance [Member]
Jun. 30, 2013
October 2012 Plan [Member]
Jun. 30, 2013
October 2012 Plan [Member]
Jun. 30, 2013
October 2012 Plan [Member]
Mar. 31, 2013
October 2012 Plan [Member]
Dec. 31, 2012
October 2012 Plan [Member]
Jun. 30, 2013
October 2008 Plan [Member]
Employee Severance [Member]
Jun. 30, 2013
October 2008 Plan [Member]
Facility Closing [Member]
Jun. 30, 2012
October 2008 Plan [Member]
Jun. 30, 2013
October 2008 Plan [Member]
Jun. 30, 2012
October 2008 Plan [Member]
Jun. 30, 2013
October 2008 Plan [Member]
Mar. 31, 2013
October 2008 Plan [Member]
Dec. 31, 2012
October 2008 Plan [Member]
Mar. 31, 2012
October 2008 Plan [Member]
Dec. 31, 2011
October 2008 Plan [Member]
Jun. 30, 2013
Employee Severance [Member]
Jun. 30, 2013
Facility Closing [Member]
Note 5 - Restructuring (Details) [Line Items]                                            
Restructuring Charges $ 9,000 $ 91,000 $ (43,000) $ 83,000   $ 9,000 $ 59,000           $ (91,000) $ 102,000 $ (83,000)              
Restructuring Reserve 200,000   200,000     66,000 66,000 66,000 210,000 896,000     697,000 105,000 697,000 105,000 224,000 448,000 622,000 728,000 100,000 100,000
Restructuring Reserve, Current 200,000   200,000                                      
Restructuring and Related Cost, Cost Incurred to Date         $ 1,700,000     $ 1,800,000     $ 4,700,000 $ 2,700,000       $ 7,400,000