Note 2 - Revenue: Schedule of changes in the contract assets and the contract liabilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Contract revenue recognized
Increase (Decrease) in Contract with Customer, Liability	$ (4,697)
Increase (Decrease) in Contract with Customer, Asset	3,371
Contract receivables recorded
Increase (Decrease) in Contract with Customer, Asset	3,404
Contract amount billed
Increase (Decrease) in Contract with Customer, Liability	$ 4,391