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Note 8 - Long-term Debt (Details Textual)
12 Months Ended
Dec. 31, 2018
USD ($)
Minimum [Member] | Variable Interest Rate Notes [Member]  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 4.00%
Debt Instrument, Periodic Payment, Total $ 5,330
Minimum [Member] | Fixed Interest Rate Notes [Member]  
Debt Instrument, Periodic Payment, Total $ 255
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.95%
Maximum [Member] | Variable Interest Rate Notes [Member]  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 4.50%
Debt Instrument, Periodic Payment, Total $ 125,833
Maximum [Member] | Fixed Interest Rate Notes [Member]  
Debt Instrument, Periodic Payment, Total $ 72,315
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 7.61%