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Note 4 - Business Combinations (Details Textual) - USD ($)
Feb. 28, 2019
Nov. 30, 2018
Oct. 26, 2018
Apr. 04, 2019
Mar. 31, 2019
Dec. 31, 2018
Aug. 10, 2017
Goodwill, Ending Balance         $ 546,000 $ 546,000  
Subordinated Note Issued with Acquisition [Member]              
Debt Instrument, Face Amount     $ 4,800,000   $ 4,800,000    
Debt Instrument, Interest Rate, Stated Percentage     8.00%        
Debt Instrument, Periodic Payment, Total $ 200,000 $ 800,000          
Subordinated Note Issued with Acquisition [Member] | Subsequent Event [Member]              
Debt Instrument, Face Amount       $ 4,500,000      
Second Amendment to LSA [Member] | East West Bank [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity     $ 37,000,000        
Proceeds from Long-term Lines of Credit     6,200,000        
Maximum Capital Expenditures     3,000,000        
The 2017 Credit Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity             $ 37,000,000
Maximum Capital Expenditures     2,500,000        
Adler Hot Oil Service, LLC [Member]              
Business Combination, Consideration Transferred, Total     12,500,000        
Business Combination, Consideration, Working Capital Adjustments     500,000        
Payments to Acquire Businesses, Gross     3,700,000        
Business Combination, Consideration Transferred, Liabilities Incurred     4,800,000        
Payments to Retire Acquiree's Debt     2,500,000        
Goodwill, Ending Balance     245,000        
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     3,200,000        
Business Acquisition, Pro Forma Information, Income (Loss) from Continuing Operations, before Tax, since Acquisition Date, Actual     371,000        
Business Acquisition, Transaction Costs     224,000        
Adler Hot Oil Service, LLC [Member] | Earn-out Payment Subject to Satisfaction of EBITDA-related Performance [Member]              
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     1,000,000        
Adler Hot Oil Service, LLC [Member] | Cash Held by Acquier, Subject Offset by Indemnification Obligations [Member]              
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 1,000,000