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Note 4 - Stock-based Compensation; Changes in Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 11, 2019
Jan. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
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%      
Dividends, Common Stock, Cash     $ 0   $ 0      
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     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           $ 3.32    
Promissory Note [Member] | John H Schwan [Member]                
Debt Conversion, Original Debt, Amount $ 600,000              
Debt Conversion, Converted Instrument, Shares Issued 180,723              
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   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               510,000
Stock Incentive Plan 2018 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized             300,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance     471,144