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Note 10 - Common Stock and Stock-based Compensation Plans (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number | [2] | 684,479 | [1] |  | 702,817
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number | [2],[3] | 610,513 |  |  |
Non-employee Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Annual Vesting, Percentage |  |  |  | 25.00% |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 4 years |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number |  | 628,547 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number |  | 555,947 |  |  |
Stock Appreciation Rights (SARs) [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards Granted |  |  |  | 400.00% |
Percentage of Stock Appreciation Rights Units Subject to Grant |  |  |  | 75.00% |
The2011 Stock Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights Vesting Percentage, Year One |  |  |  | 25.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Vesting Period |  |  |  | 3 years |
Stock Options and SARs [Member] |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 108 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 1 year 36 days |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 18,786 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 1 year 255 days |  |  |
[1] | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 628,547 shares of the Company's common stock issuable upon exercise.
[2] | The SAR units are convertible for a maximum number of shares of the Company's common stock equal to 75% of the SAR units subject to the grant.
[3] | Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 555,947 shares of the Company's common stock issuable upon exercise.

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