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Note 9 - Stock Ownership Plans - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Outstanding, Shares (in shares) | shares 1,100
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.88
Exercised, Shares (in shares) | shares (83)
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 2.11
Cancelled, Shares (in shares) | shares (58)
Cancelled, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 2.01
Outstanding, Shares (in shares) | shares 959
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.86
Outstanding, Weighted Average Remaining Contractual Term (Year) 1 year 328 days
Outstanding, Aggregate Intrinsic Value | $ $ 497
Exercisable, Shares (in shares) | shares 959
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.86
Exercisable, Weighted Average Remaining Contractual Term (Year) 1 year 328 days
Exercisable, Aggregate Intrinsic Value | $ $ 497