Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019
Income Tax Expense (Benefit), Total	$ 1,065	$ 7,618	$ 1,423	$ 7,832
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	$ 2,991	$ 1,097	$ 3,933	$ 1,737
Effective Income Tax Rate Reconciliation, Percent, Total	35.00%	694.00%	36.00%	451.00%
Income Tax Expense (Benefit), Before Tax Cuts and Jobs Act		$ 400		$ 600
Effective Income Tax Rate Reconciliation, Before Tax Cuts and Jobs Act, Percent		33.50%		33.50%
Deferred Tax Assets, Valuation Allowance, Total	$ 0		$ 0
Foreign Tax Authority [Member] | Secretariat of the Federal Revenue Bureau of Brazil [Member]
Unrecognized Tax Benefits, Ending Balance	$ 200		$ 200
Scenario, Forecast [Member]
Additional Tax Rate On Foreign Income					10.50%
Effective Income Tax Rate, Reconcilation Effected by GILTI, Estimate Increase					8.00%