Annual report pursuant to Section 13 and 15(d)

Note 10 - Leases (Details Textual)

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Note 10 - Leases (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating Leases, Rent Expense, Net, Total $ 1.5 $ 1.0
Pump Assets [Member]    
Capital Leased Assets, Gross, Total 0.6 1.7
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation $ 0.2 $ 0.5
Capital Leases [Member]    
Debt, Weighted Average Interest Rate 3.50%