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Note K - Notes Payable and Long-term Debt (Details Textual)
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Minimum [Member]  
Debt Instrument, Term 3 years
Maximum [Member]  
Debt Instrument, Term 5 years
Notes Payable to Bank, Noncurrent $ 43.6
Long-term Debt, Weighted Average Interest Rate 2.31%