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Note 6 - Long-term Debt - Components of Long-term Debt (Details) (Parentheticals)
Dec. 31, 2017
Mar. 31, 2017
Line of Credit [Member]    
Line of credit, interest rate at end of period 3.44% 3.44%
Term Loan [Member]    
Term loan, interest rate at end of period 3.63% 3.63%