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9. Income taxes (Tables)
 12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Provision for income taxes
   For the Years Ended December 31, 
   2017   2016 
Current:        
Federal  $(359)  $2,117 
State and local   193    572 
Total current   (166)   2,689 
Deferred   (292)   (531)
Provision (benefit) for income taxes  $(458)  $2,158 
Reconciliation to effective rate for income taxes
   2017  2016
   Amount   Percentage    Amount   Percentage
Federal income tax computed at the statutory rate   (274)   34.0 %     $1,917    34.0 % 
State and local tax, net   1    (0.1)%     320    5.7 %
U.S. domestic manufacturers’ deduction & other permanent differences   111    (13.8)%     113    2.0 % 
Changes for tax positions of prior years   118    (14.6)%     (202)   (3.5)%
Change in tax rates (a)   (378)   47.0 %      2    0.0 % 
Change in tax estimate   (36)   4.5 %     8    0.1 %
Provision (benefit) for income taxes   (458)   57.0 %     $2,158    38.3 % 
Schedule of deferred tax assets and liabilities
   December 31, 
   2017   2016 
Deferred tax liabilities attributable to:          
Accumulated depreciation and amortization  $(1,784)  $(1,854)
Total net deferred tax liabilities   (1,784)   (1,854)
Deferred tax assets attributable to:          
Net operating losses   14    – 
Capital loss carry-forward & investment impairment   122    166 
Incentive compensation   255    126 
Inventory   335    331 
Allowances for doubtful accounts and discounts   161    39 
Other   57    – 
Total net deferred tax assets   944    662 
Net deferred tax liabilities  $(840)  $(1,192)
Reconciliation of amount of unrecognized tax benefits
   2017   2016 
Balance at January 1  $63   $265 
Additions for tax positions of prior years   118    63 
Release for tax positions of prior years   –    (265)
Balance at December 31  $181   $63