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Note 11 - Debt - Revolving Credit Facilities (Details) - Revolving Credit Facility [Member]
Mar. 31, 2018
USD ($)
Principal, credit facility $ 198,850
Revolving Credit Facility A [Member]  
Interest rate, loans with governmental agencies 3.50%
Principal, credit facility $ 58,092
Revolving Credit Facility B [Member]  
Interest rate, loans with governmental agencies 3.95%
Principal, credit facility $ 60,811
Revolving Credit Facility C [Member]  
Interest rate, loans with governmental agencies 3.00%
Principal, credit facility $ 60,199
Other Revolving Credit Facilities [Member]  
Interest rate, loans with governmental agencies 4.20%
Principal, credit facility $ 19,748