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Note 8 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 2,400,000		$ 2,400,000		$ 2,400,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	139,000		139,000		139,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0		0		$ 0
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount	$ 132,000	$ 191,000	$ 62,000	$ 169,000
Domestic Tax Authority [Member]
Open Tax Year			2018
State and Local Jurisdiction [Member]
Open Tax Year			2018

X

- Definition

Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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-Section 50
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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return.

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Amount of interest expense accrued for an underpayment of income taxes.

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