Note 12 - Debt (Details Textual) - Wells Fargo [Member] $ in Thousands	Nov. 02, 2018 USD ($)	May 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)
Revolving Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 25,000
Long-term Line of Credit, Total							$ 0
Leverage Ratio, Maximum		2.5
Debt Instrument, Minimum Adjusted EBITDA		$ 10,000
Revised Revolving Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 15,000
Leverage Ratio, Maximum	2
Debt Instrument, Minimum Adjusted EBITDA						$ 2,500	$ 1,000
Line of Credit Facility, Additional Requestable Maximum Borrowing Capacity	$ 10,000
Debt Instrument, Debt Covenant, Minimum Unrestricted Cash Balance	$ 15,000
Revised Revolving Line of Credit [Member] | Scenario, Forecast [Member]
Debt Instrument, Minimum Adjusted EBITDA			$ 10,000	$ 6,500	$ 4,000