Note 3 - Changes in Accounting Policies: Schedule of impacts of accounting changes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 8,365	$ 5,276
Restricted cash	220	312
Contract revenue in excess of billings	3,484	2,763
Inventories, net	3,072	3,973
Total assets	27,161	25,030
Billings in excess of contract revenue	5,959	7,117
Total liabilities	19,157	21,805
Accumulated deficit	(42,778)	(47,208)
Total stockholders' equity	8,004	3,225
Total liabilities and stockholders' equity	27,161	25,030
Sales	37,193	30,508
Selling, general and administrative	(6,561)	(6,045)
Income tax provision	(21)	111
Net income	3,747	1,481
Changes in operating assets and liabilities:
Decrease in inventories	449	327
Increase in contract revenue in excess of billings	(33)	1,651
Increase in billings in excess of contract revenue	(306)	305
Net cash provided by operating activities	3,729	(1,098)
Net cash used in investing activities	(101)	(148)
Net cash used in financing activities	(631)	$ (592)
As reported
Cash and cash equivalents	8,365
Restricted cash	220
Contract revenue in excess of billings	3,484
Inventories, net	3,072
Others	12,020
Total assets	27,161
Billings in excess of contract revenue	5,959
Others	13,198
Total liabilities	19,157
Accumulated deficit	(42,778)
Others	50,782
Total stockholders' equity	8,004
Total liabilities and stockholders' equity	27,161
Sales	37,193
Cost of sales	(23,469)
Selling, general and administrative	(6,561)
Income tax provision	(21)
Others	(3,395)
Net income	3,747
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Other	1,057
Changes in operating assets and liabilities:
Decrease in inventories	449
Increase in contract revenue in excess of billings	(33)
Increase in billings in excess of contract revenue	(306)
Increase in contract liabilities	(353)
Net cash provided by operating activities	3,729
Net cash used in investing activities	(101)
Net cash used in financing activities	(631)
Scenario, Adjustment
Cash and cash equivalents	0
Restricted cash	0
Contract revenue in excess of billings	(1,130)
Inventories, net	712
Others	0
Total assets	(418)
Billings in excess of contract revenue	44
Others	0
Total liabilities	44
Accumulated deficit	(462)
Total stockholders' equity	(462)
Total liabilities and stockholders' equity	(418)
Sales	432
Cost of sales	(211)
Selling, general and administrative	0
Income tax provision	0
Others	0
Net income	221
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Other	0
Changes in operating assets and liabilities:
Decrease in inventories	(211)
Increase in contract revenue in excess of billings	(1,130)
Increase in billings in excess of contract revenue	(1,562)
Increase in contract liabilities	0
Net cash provided by operating activities	0
Net cash used in investing activities	0
Net cash used in financing activities	0
Balances without adoption of Topic 606
Cash and cash equivalents	8,365
Restricted cash	220
Contract revenue in excess of billings	2,354
Inventories, net	3,784
Others	12,020
Total assets	26,743
Billings in excess of contract revenue	6,003
Others	13,198
Total liabilities	19,201
Accumulated deficit	(43,240)
Others	50,782
Total stockholders' equity	7,542
Total liabilities and stockholders' equity	26,743
Sales	37,625
Cost of sales	(23,680)
Selling, general and administrative	(6,561)
Income tax provision	(21)
Others	(3,395)
Net income	3,968
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Other	1,057
Changes in operating assets and liabilities:
Decrease in inventories	238
Increase in contract revenue in excess of billings	(1,163)
Increase in billings in excess of contract revenue	(1,868)
Increase in contract liabilities	(353)
Net cash provided by operating activities	3,729
Net cash used in investing activities	(101)
Net cash used in financing activities	$ (631)