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Note 1 - Summary of Operations and Significant Accounting Policies (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Note 1 - Summary Of Operations And Significant Accounting Policies Details Narrative    
Impairments of long-lived assets $ 0 $ 0
Impairments of indefinite lived intangible assets 150 0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months   166
Finite-Lived Intangible Assets, Amortization Expense, Year Two   121
Finite-Lived Intangible Assets, Amortization Expense, Year Three   85
Finite-Lived Intangible Assets, Amortization Expense, Year Four   62
Finite-Lived Intangible Assets, Amortization Expense, Year Five   49
Foreign Currency Transaction Gain (Loss), Realized 48 235
Advertising Expense 59 43
Total research and development spending 6,112 5,648
Customer sponsored R&D included in cost of goods sold 509 315
Revenue recognized relating to customer sponsored R&D 509 317
Write-off of capitalized costs - NYSERDA project $ 0 $ 161
Significant customer disclosure - revenue from large defense contractor 18.00% 24.00%
Significant customers - trade accounts receivable - largest 0.00% 16.00%
Employee stock options excluded from calculation of diluted earnings per share 945,687 2,195,222
Stock options included in calculation of diluted earnings per share 1,312,282 0
Number of shares added to earnings per share calculation by stock option 260,318 0
Restricted stock units included in calculation of diluted earnings per share 32,800 0
Number of shares added to earnings per share calculation by restricted stock units 15,385 0