| Note 4 - Fair Value Measurements - Liability Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - Contingent Consideration [Member] - Fair Value, Inputs, Level 3 [Member] $ in Thousands | 3 Months Ended | 
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| Sep. 30, 2020  USD ($) | |
| Fair value at the beginning of period | $ 6,137 | 
| Change in fair value of contingent consideration | (150) | 
| Payments | 0 | 
| Fair value at the end of period | $ 5,987 | 
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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| X | ||||||||||
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Details 
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- Details 
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