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Note 7 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Jun. 30, 2019
Jul. 01, 2018
Jul. 02, 2017
Unrecognized Tax Benefits, Ending Balance       $ 0  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total       $ 0  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00%   27.50% 34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ (604,190)        
Decrease in Deferred Tax Liabilities from Tax Act       $ 651,807
Earnings Per Share, Adjustment Due to Change in Enacted Tax Rate       $ 0.13  
Scenario, Forecast [Member]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%