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Note 4 - Stock-based Compensation; Changes in Equity (Details Textual) - USD ($)
$ / shares in Units, xbrli-pure in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 11, 2019
Jan. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 20, 2018
Jun. 08, 2018
Apr. 10, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate     0.00% 0.00%      
Share-based Payment Arrangement, Expense     $ 29,000 $ 62,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     164,000        
Expected Recognized Compensation Expenses, Remainder of the Fiscal Year     63,000        
Expected Recognized Compensation Expenses in Year Two     $ 56,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)     471,144 471,144      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 78,000        
Stock Issued During Period, Value, New Issues            
Share Price (in dollars per share)         $ 3.32    
Promissory Note [Member] | John H Schwan [Member]              
Debt Conversion, Original Debt, Amount $ 600,000            
Debt Conversion, Converted Instrument, Shares Issued (in shares) 180,723            
Common Stock [Member] | Disputed Compensation Amounts by Claimants [Member] | God’s Little Gift, Inc. (d\b\a) Helium and Balloons Across America and Gary Page [Member]              
Stock Issued During Period, Shares, New Issues (in shares)   20,000          
Stock Issued During Period, Value, New Issues       $ 67,000      
Stock Incentive Plan 2009 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)           300,000 510,000
Stock Incentive Plan 2018 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)     471,144