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Note 1 - Summary of Significant Interim Accounting Policies (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) shares | Mar. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | May 02, 2018 USD ($) | May 01, 2018 USD ($) | Mar. 01, 2018 USD ($) | Jan. 01, 2018 USD ($)
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 86,552 | $ 73,087 |  |  |  |  |  |  |
Contract with Customer, Asset, Net, Current, Total | 47,359 |  |  |  | $ 49,236 |  |  |  |
Amortization of Intangible Assets, Total | 1,000 | 800 |  |  |  |  |  |  |
Selling, General and Administrative Expense, Total | $ 25,863 | 21,182 |  |  |  |  |  |  |
Number of Reportable Segments | 3 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares | 3,308,588 |  |  |  |  |  |  |  |
Operating Lease, Liability, Total | $ 3,867 |  |  |  |  |  |  |  |
Operating Lease, Liability, Current | 1,000 |  |  |  |  |  |  |  |
Operating Lease, Liability, Noncurrent | 2,866 |  |  |  |  |  |  |  |
Lessee, Operating Lease, Liability, Payments, Due, Total | $ 4,343 |  |  |  |  |  |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 5.74% |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 4,581 |  |  |  |  |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | 18,000 |  |  |  |  |  | $ 17,500 | $ 18,000 |
Derivative, Swaption Interest Rate |  |  |  |  |  |  | 3.05% |  |
Interest Rate Swap [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | $ 17,500 |  |  |
Shipping and Handling [Member] |  |  |  |  |  |  |  |  |
Selling, General and Administrative Expense, Total | 3,400 |  | $ 2,700 |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 4,900 |  |  |  |  |
Prepaid Rent |  |  |  | (800) |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | (1,794) | $ 3,800 |  |  |  |  |  |  |
Contract with Customer, Asset, Net, Current, Total | 47,359 |  |  |  |  |  |  |  |
Selling, General and Administrative Expense, Total | $ 41 |  |  |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  | $ 11,200
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |
Operating Lease, Liability, Total |  |  |  | 4,100 |  |  |  |  |
Operating Lease, Liability, Noncurrent |  |  |  | 3,100 |  |  |  |  |
Lessee, Operating Lease, Liability, Payments, Due, Total |  |  |  | $ 4,600 |  |  |  |  |
Operating Lease, Weighted Average Discount Rate, Percent |  |  |  | 5.74% |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 4,900 |  |  |  |  |
Accounting Standards Update 2016-02 [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |  |  |
Operating Lease, Liability, Current |  |  |  | $ 1,000 |  |  |  |  |
BAMKO [Member] |  |  |  |  |  |  |  |  |
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest | 99.00% |  |  |  |  |  |  |  |

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