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Note 13 - Subsequent Events (Details Textual) - Subsequent Event [Member] - Twentieth Amendment to Credit Agreement [Member]
$ in Millions
Sep. 11, 2019
USD ($)
Line of Credit Facility, Maximum Borrowing Capacity $ 20
Line of Credit Facility, Ownership Interest Pledged 66.00%
Line of Credit Facility, Commitment Fee Percentage 0.25%
Debt Instrument, Basis Spread on Variable Rate 3.25%
Letter of Credit [Member]  
Long-term Line of Credit, Total $ 1