Note 5 - Long-Term Debt and Credit Facility (Details) - Debt Instruments Table (USD $)	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2013	Jul. 01, 2013
Long-term debt, term note and notes payable:
Other notes with interest rates from 3.3% to 6.5%	$ 12,600,000	$ 11,890,000
Subtotal	377,475,000	388,640,000
Less – Current maturities and notes payable	26,399,000	22,024,000
Long-term debt, less current maturities	351,076,000	366,616,000
Principal payments in next five years:
2014	26,399,000
2015	34,932,000
2016	41,784,000
2017	274,360,000
2018	0
Long-term debt, less current maturities	351,076,000	366,616,000
2013 Credit Facility [Member]
Long-term debt, term note and notes payable:
Term note, current annualized rate 2.21% due July 1, 2018	319,375,000	341,250,000	350,000,000
Line of credit, 2.17% in 2013 and 2.49% in 2012	45,500,000			35,500,000
2011 Credit Facility [Member]
Long-term debt, term note and notes payable:
Line of credit, 2.17% in 2013 and 2.49% in 2012		$ 35,500,000