Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

No definition available.

Name:	us-gaap_MultiemployerPlansWithdrawalObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Note 11 - Commitments and Contingent Liabilities (Details Textual)		3 Months Ended
	Jun. 30, 2017 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2019
Number of Multiemployer Pension Plans			3
Plan Partially Withdrawn From in 2017 [Member] \| Multiemployer Plans, Pension [Member]
Multiemployer Plans, Withdrawal Obligation	$ 2,600,000
Multiemployer Plans, Withdrawal Obligation, Period	20 years
CWA ITU Multiempoyer Plan [Member] \| Multiemployer Plans, Pension [Member]
Multiemployer Plans, Expenses for Lability Incurred		$ 500,000