Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Debt and Other Financing Arrangements (Details Textual)

v3.7.0.1
Note 5 - Debt and Other Financing Arrangements (Details Textual) - Revolving Credit Facility [Member] - USD ($)
$ in Millions
Jul. 28, 2016
Mar. 31, 2017
Line of Credit Facility, Current Borrowing Capacity $ 400.0  
Line of Credit Facility, Additional Borrowing Capacity $ 200.0  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.15%  
Line of Credit Facility, Expiration Date Jul. 28, 2021  
Long-term Line of Credit   $ 343.5
Federal Funds Effective Swap Rate [Member]    
Debt Instrument, Basis Spread on Variable Rate 0.50%  
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]    
Debt Instrument, Basis Spread on Variable Rate 1.00%  
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]    
Debt Instrument, Basis Spread on Variable Rate 1.75%