Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Leases (Details Textual)

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Note 10 - Leases (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Operating Leases, Rent Expense, Net, Total $ 0.4   $ 0.2 $ 1.1 $ 0.7    
Maximum [Member]              
Future Lease Payments Expense, Exited Leases   $ 0.1          
Pump Assets [Member]              
Capital Leased Assets, Gross, Total 1.7     1.7   $ 14.0 $ 1.7
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation $ 0.7     $ 0.7     $ 0.5
Capital Leases [Member]              
Debt, Weighted Average Interest Rate 4.00%     4.00%