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Note 12 - Commitments and Contingencies (Details Textual) - BND [Member]
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Mar. 06, 2019
a
Area Available for Lease (Acre) | a   984
Lessee, Operating Lease, Liability, to be Paid Per Quarter | $ $ 1.5