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%