Amount before tax of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a discontinued operation.

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Name:	us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Note 6 - Discontinued Operations (Details Textual) - Dillco Fluid Service, Inc [Member] - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax, Total
Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax, Total
Discontinued Operations, Disposed of by Sale [Member]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax, Total	$ 129,000
Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax, Total				$ 130,000