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Adjustments to rental expense for the reporting period incurred under operating leases due to escalation clause, including minimum and any contingent rent expense, net of related sublease income.

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Amount of operating lease expense. Excludes sublease income.

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Note 8 - Commitments and Contingencies (Details Textual) $ in Millions		12 Months Ended
	Jan. 04, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Feb. 27, 2019 EUR (€)
Operating Lease, Weighted Average Discount Rate, Percent		9.50%
Operating Lease, Expense		$ 2.3
Lessee, Operating Lease, Renewal Term		5 years
Operating Lease, Payments		$ 2.0
Operating Leases, Rent Expense, Net, Total			$ 1.9	$ 1.9
Adjustments to Rent Expense Due to Escalation Clause and Lease Incentives			0.3	0.3
Additional Facility Charges		0.1	0.1	0.1
License Fees and Supply Costs		0.4	0.5	0.3
Professional Fees		0.2	$ 0.3	$ 0.3
Settled Litigation [Member] \| Anti-Retaliation Termination [Member]
Litigation Settlement, Amount Awarded to Other Party	$ 4.0
Pending Litigation [Member] \| Deposit With Court as Security [Member]
Estimated Litigation Liability \| €					€ 416,000
Pending Termination [Member]
Commitments Paid from Inception		5.1
Significant Contracts Future Commitments		$ 28.5
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term		1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term		11 years