Note 14 - Long-term Debt and Credit Arrangements - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Total debt	$ 403,104	$ 382,405	$ 433,722
Other	12,479	(845)	(1,062)
Long-term Debt, Current Maturities, Total	8,263	47,286	116,796
Long-term Debt, Excluding Current Maturities, Total	394,841	335,119	316,926
Senior Notes [Member] | The 2019 Notes [Member]
Total debt	0	40,000	80,000
Long-term Debt, Current Maturities, Total		40,000	40,000
Term Loan [Member] | The Credit Agreement [Member]
Total debt	140,625	146,250	148,125
Long-term Debt, Current Maturities, Total	7,500
Long-term Debt, Excluding Current Maturities, Total	133,100	138,800	140,600
Line of Credit [Member] | The Credit Agreement [Member] | Revolving Credit Facility [Member]
Total debt	250,000	197,000	137,000
Convertible Debt [Member]
Total debt	$ 0	$ 0	$ 69,659