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Note 9 - Capital Stock and Stock-based Compensation (Details Textual) $ / shares in Units, $ in Millions			3 Months Ended		6 Months Ended
	Jun. 11, 2020 shares	May 16, 2019	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 $ / shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)	3,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	24,608,929
Fungible Share Ratio for Deferred Stock Awards	1.49	1.79
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			3,264,267		3,264,267
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $			$ 6.5		$ 6.5
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					2 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares			$ 1.21	$ 0.97	$ 1.21	$ 1.56
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)					5,727,716	3,300,586
Market Condition Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares					$ 2.98	$ 4.16

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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